How did you mount DOI content? 3 years ago it switched from using DOI and mount.cfg to subscribing to all doi-content-pack parts on workshop - make sure you really have all of them. Same for btk.

I have downloaded all parts from the workshop, I have double checked it. I unsubscribed then resubscribed twice, restarted the game and everything. I do not have DOI or B2K (the actual game not the mod) but it still runs fine on my main computer. hmm

and what does Client ext. section in spawnmenu/utilities/cw2 say about ins2/doi content?

Main computer (T = Ticked and green C = Cross and red)

T base
T EXT
T DOI
T B2K

Ok Ins/ins2-ds content
missing AO5 content
missing Screaming Steel content

Laptop
T base
C EXT
C DOI
T B2k
C AO5
C SS

Essentially I have downloaded the exact content on both laptop and tower and the only one that actually works is my tower computer. However, both claim that I have not downloaded B2K and/or DOI.

you might need to download EXT pack for DOI to work

I downloaded the EXT pack.

interesting side note :
my laptop now has access to a series of guns called the KHR INS2 WSX which my tower computer does not have. I am wondering why my laptop is missing the essential weapons but has given me weapons which i had no idea existed like the FN F2000 or the glock 17 or HK USP Tactical or Desert Eagle etc. Odd. Although I am unsure if this is even part of the mod pack or if these are community weapons.

3rd party sweps always do whatever... what does say in console? should be 15

When I loaded into the game, this message appeared in the console. Sorry it's rather long. By the way, where would i find that statement in the console. And just FYI this series of statements came from my laptop instead of my tower computer as my laptop is having a greater issue as it doesn't work.

recache unknown particle system "ins_c4_explosion_sparks_burst"!
Attemped to precache unknown particle system "ins_Water_explosion"!
Attemped to precache unknown particle system "molotov_trail"! (x2)
Attemped to precache unknown particle system "weapon_compB_fuse"! (x2)
Failed to load custom font file 'c:/program files (x86)/steam/steamapps/common/garrysmod/garrysmod/workshop/resource/fonts/exodr.ttf'
Failed to load custom font file 'c:/program files (x86)/steam/steamapps/common/garrysmod/garrysmod/workshop/resource/fonts/gnuolanedr.ttf'
Failed to load custom font file 'c:/program files (x86)/steam/steamapps/common/garrysmod/garrysmod/workshop/resource/fonts/prototype.ttf'
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/lense_rt.vmt
Error: Material "models/weapons/optics/lense_rt" uses unknown shader "??t???�?6???o?�???????�?????�?p???=???4?�?S?"
Error: Material "cwkk/reticles/aimpoint_dot_col" uses unknown shader "vmt"
KeyValues Error: LoadFromBuffer: missing { in file materials/cwkk/reticles/aimpoint_dot_top.vmt
Error: Material "cwkk/reticles/aimpoint_dot_top" uses unknown shader "�"
KeyValues Error: LoadFromBuffer: missing { in file materials/cwkk/reticles/acog.vmt
Error: Material "cwkk/reticles/acog" uses unknown shader "|?|??U?�"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_cstm_barska/barska_reticule.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_cstm_barska/barska_reticule.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_cstm_barska/barska_reticule.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_cstm_barska/barska_reticule.vmt
Error: Material "models/weapons/attachments/cw_kk_ins2_cstm_barska/barska_reticule" uses unknown shader "$"
KeyValues Error: LoadFromBuffer: missing { in file materials/cwkk/reticles/pgo7.vmt
Error: Material "cwkk/reticles/pgo7" uses unknown shader "??"
Error: Material "cwkk/reticles/eotech_reticule_col" uses unknown shader "vmt"
Error: Material "cwkk/reticles/eotech_reticule_top" uses unknown shader "vmt"
Error: Material "cwkk/reticles/kobra_dot_col" uses unknown shader "vmt"
Error: Material "cwkk/reticles/kobra_dot_top" uses unknown shader "vmt"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_shared/fake.vmt
Error: Material "models/weapons/attachments/cw_kk_ins2_shared/fake" uses unknown shader "?????1e)((???1E)"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/enfield_crosshair.vmt
Error: Material "models/weapons/optics/enfield_crosshair" uses unknown shader "???????????????????????????????????????????????????????????????????????????????????????????????????????"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/kar98k_crosshair.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/kar98k_crosshair.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/kar98k_crosshair.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/kar98k_crosshair.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/kar98k_crosshair.vmt
Error: Material "models/weapons/optics/kar98k_crosshair" uses unknown shader "Q�?�?�?�?�?"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/weaver_crosshair.vmt
Error: Material "models/weapons/optics/weaver_crosshair" uses unknown shader "????????????????????????????????????????????????????????"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/mosin_crosshair.vmt
Error: Material "models/weapons/optics/mosin_crosshair" uses unknown shader "W�?�?�V�8�?�?"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/zf4_crosshair.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/zf4_crosshair.vmt
Error: Material "models/weapons/optics/zf4_crosshair" uses unknown shader "b!?�?"
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_knife_fat.vmt
?_B??|?, ???>aG?9q?fm�|?, ??z?]@,??Kg�?|?, ????a=w?֮Ӝ_??, ?nߗ^1x9;�???,
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_knife_fat.vmt
?_B??|?, ???>aG?9q?fm�|?, ??z?]@,??Kg�?|?, ????a=w?֮Ӝ_??, (*?nߗ^1x9;�???*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_knife_fat.vmt
?_B??|?, ???>aG?9q?fm�|?, ??z?]@,??Kg�?|?, (*????a=w?֮Ӝ_??*), (*?nߗ^1x9;�???*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_knife_fat.vmt
?_B??|?, ???>aG?9q?fm�|?, (*??z?]@,??Kg�?|?*), (*????a=w?֮Ӝ_??*), (*?nߗ^1x9;�???*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_knife_fat.vmt
?_B??|?, (*???>aG?9q?fm�|?*), (*??z?]@,??Kg�?|?*), (*????a=w?֮Ӝ_??*), (*?nߗ^1x9;�???*),
Error: Material "atts/kk_ins2_ww2_knife_fat" uses unknown shader "?_B??|?"
KeyValues Error: RecursiveLoadFromBuffer: got NULL key in file materials/atts/kk_ins2_ww2_nade_jackit.vmt
?|?, m?|?, ??-O;o?P?XA?|?, n??NP:?�?Ή�?|?, ꪬ?Y7?t䊭?|?,
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_nade_jackit.vmt
?|?, m?|?, ??-O;o?P?XA?|?, n??NP:?�?Ή�?|?, (*ꪬ?Y7?t䊭?|?*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_nade_jackit.vmt
?|?, m?|?, ??-O;o?P?XA?|?, (*n??NP:?�?Ή�?|?*), (*ꪬ?Y7?t䊭?|?*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_nade_jackit.vmt
?|?, m?|?, (*??-O;o?P?XA?|?*), (*n??NP:?�?Ή�?|?*), (*ꪬ?Y7?t䊭?|?*),
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_nade_jackit.vmt
?|?, (*m?|?*), (*??-O;o?P?XA?|?*), (*n??NP:?�?Ή�?|?*), (*ꪬ?Y7?t䊭?|?*),
Error: Material "atts/kk_ins2_ww2_nade_jackit" uses unknown shader "?|?"
KeyValues Error: RecursiveLoadFromBuffer: got EOF instead of keyname in file materials/atts/kk_ins2_ww2_sling.vmt
RF4?��u?|?,
Error: Material "atts/kk_ins2_ww2_sling" uses unknown shader "RF4?��u?|?"
Error! Variable "{" is multiply defined in material "atts/kk_ins2_ww2_sling"! (x8)
KeyValues Error: LoadFromBuffer: missing { in file materials/atts/kk_ins2_ww2_stripper.vmt
Error: Material "atts/kk_ins2_ww2_stripper" uses unknown shader "H?�?9|˜?????"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_shared/fake20.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/attachments/cw_kk_ins2_shared/fake20.vmt
Error: Material "models/weapons/attachments/cw_kk_ins2_shared/fake20" uses unknown shader "?UFb?Ir???�Z?IS??Fb?I�???Gb?QWxb?�Z?I?"
KeyValues Error: LoadFromBuffer: missing { in file materials/models/weapons/optics/binocs_overlay_german.vmt
Error: Material "models/weapons/optics/binocs_overlay_german" uses unknown shader "U??n?????v?????(???[??????$???`????�?�?f?U?a?s?????�?,???O?"
Error: Material "vgui/inventory/cw_kk_ins2_m1a1_para" uses unknown shader "vmt"

And when I spawned a molotov, This showed up

KeyValues Error: LoadFromBuffer: missing { in file materials/models/hands/vip_hands_color.vmt
KeyValues Error: LoadFromBuffer: missing { in file materials/models/hands/vip_hands_color.vmt
Error: Material "models/hands/vip_hands_color" uses unknown shader "E<?1ѥٹ?�a�"
Error: Material "models/hands/us_sleeve_vip" uses unknown shader "vmt"
Model missing: models/weapons/v_cw_kk_ins2_hands_css.mdl

sry, what I meant was type/paste into console while you're running gmod with map loaded and pls post back answer you get (it will be on following line after that command)

13
What does that mean?

that means you are missing 2 doi downloads from workshop, either you missed them when subscribing or they didn't download/mount properly or you might have disabled them main menu/addons

Oh okay thanks. I will double check that.

It works! All I had to do was reinstall the EXT, DOI and B2K addons and now they work. Thank you and I'm pretty sure I over exaggerated the title a little too much. It should have been a no brainer on what I had to do as it is like the first thing to try when a mod doesn't work (reinstall). But thanks again for helping me with this issue.