Okay so since there are no signs it'll be fixed, I took it upon myself to help out people and to provide a link to the file of Solais' Additional Laser Colors Mod, with instructions on how to use it:
https://drive.google.com/drive/folders/12EfHnta8ExY-Ir2iwidjLPOci93N5jL0?usp=sharing

I don't want to appear as if I'm profiting off of it since my reason is that I Let's Played it (in French), it's just to help people out.

@jean-luc:
OK thanks.
Corrected the script. It works now.

The code after you complete the pyramid puzzles

@jean-luc:
What world? Which puzzle?
Unfortunately I don't know what you mean.

so I was replaying the map and i noticed that the code puzzle in the area you unlock with the pink and light blue after getting all the green sigils but not the stars and the code didn't appear even after i restarted is that intentional or a bug

Hot patch!
The Pyramid - Puzzle 02:
It is no longer possible to take things outside.
The game occasionally crashed when the player went outside
was teleported. This error has now also been eliminated.

Have uploaded a new big update:
All Worlds: Visibility sectors have been added.
All worlds: postpocessing effects processed, lightning.
The Pyramid - Puzzle 01: The tricky jump to the roof has been removed,
this will automatically land the player on the roof.
A few scripts have been worked up.
All worlds: a few minor repairs.
Tidied up the folder a little. Delete unnecessary files.

Special update is ready.(But only for the old version!)
Now the cat in the pyramid also appears,
if she is released at the end of the game,
without reset.

barrymead:
I already realised that. Thanks for the hint.
A small change to the script is needed to make the cat appear
if you release them only at the end of the game.
Let's see, maybe there will be a special update.

ma.hirsch: I realize that updates will not be made to the older version or newer version until croteam fixes the workshop upload stuff, but when that happens I wanted you to be aware of a little anomaly concerning the white cat. If you release the cat on your first visit to the pyramid then it appears again at the end. If, however, you release the cat on your second visit to the pyramid it does not remember the cat unless you reset or exit the game after releasing the cat.

I'm sorry. Updates will not be available until the developers have repaired the workshop.
During this time please take the old version.

something called "BatchedParticles.mtr" makes that game crash

Very strange. Before release, I tested it under Windows 10.

windows 10

I know it. Which operating system do you have?

i noticed that the error is for a particle file

my version 440323

@jean-luc:
It works with all the required content. (See above, in the description.)
Only in Linux the new version does not work yet. Sorry.

The new version of the map is unable to load

Oh well, thanks for the effort. Digging through Steam folders trying to get this to work, I found out where the player profile is saved, so I will probably revert to the older build to play it sometime.

@Alby:
At the moment, unfortunately, I do not know any further. I'm working with Windows 7. (I have not installed Linux.)

Yes I have, validates fine.

Also, that's 440323 on Linux, not 440323 on Windows. But still, never had any problem running any workshop maps before.

@Alby:
Strange. Have you ever had the installation folder checked for errors?

440323

@Alby:
Which version will be displayed at the start of Talos Principle in the upper right corner?

Still not working. I also tried moving the workshop folder with the legacy .gro files somewhere else.

@Alby:
There may be a conflict with another map from the community.
Just take all out of the Talos folder, except for Additional Laser Colors.
Then try again.

That's strange, never played the VR version, that error is coming up in the normal Talos Principle.

@Alby:
Does it work now?
The error with the "BatchedParticles" occurs only in the VR version.

Additional Laser Colors you also have to copy the -.gro file into the Talos folder.

Yes I even reinstalled DLC to make sure they were compatible with new engine. I knew additional lasers worked because I used those in other maps, The Day After I believe.

@Alby:
Did you install all required DLCs and additional Laser Colors?
(This version does not work in VR yet!)

Followup: moddable version comes up with "unable to load level.", although instead of crashing, that error is contained in the game instead of in a seperate window.

When I try to open the dropbox map in the new engine the game crashes with this error:
Cannot open file Content/Talos/Presets/Shaders/BatchedParticles.mtr

Also just before that error the console prints out "Mismatched number of external files detected in Content/Talos/Levels/Only Puzzles 2/OnlyPuzzles2.rsc"

Alright, tnx!

Yes.

Is this what I need?
https://psteamproxy.yuanyoumao.com/app/322022/The_Talos_Principle__Prototype_DLC/

@Agenta Thank u very much, I'll look into it. I enjoyed the map a lot and was a bit sad yesterday when I thought I couldn't finish it. Maybe if I install the prototype DLC it will work.
I'm very grateful for ur response!

@calwin. This map-set requires the Prototype DLC to be installed. If you don't have that DLC that level cannot be loaded.

I play with the old modable version btw.

I get 'unable to load level' when I try to load world 2 (code 4783)
Don't know how to fix this. I tried several times after restoring a backup and it happens every time.
If I quit and start the game again I'm stuck at the loading and it loads forever.

@rainbeauxbread:
Unfortunately, some regions can not load from Dropbox.
In this case, please go back to the old version.
There they all work.
Sorry.

i can't load the .gro file

Have uploaded a new update.
All Worlds - Puzzle Terrains are changed.
Other various changes.

@Barrymead : Thanks. What could we do without your precious help ?

barrymead; and for all subscribers:

OK. Will remember if I update the thing.
The sole re-save is not enough. The computer terminals
will not work after the update, so the level will not be loaded!
So there is still a lot of work ahead of me, it will take some time.
That's why this version of the game stays with you for a while.
Sorry for this adversity.

That worked for me too. Seems as though you have no choice but to accept and download the forced update. Workshop maps won't work. Then follow barrymead's directions for downloading the previous version. These same instructions are included in the note to the update which is how I figured out the workaround.

Agenta1999: I found a way to get the workshop files to work again. Click on the steam icon then library, then right click on the Talos Principle and then Properties. Then open the Betas tab and use the pulldown to select "Previous Version" (The game will download the older version, then you will be able to play the workshop maps again.

Oh NVM. Apparently I can't access them either.

@barrymead Well strangely I can still play all of the custom maps and workshop content on the most recent patch. Any explanation for that?

derbyr:
Is it the same with all workshop content?
I can not check it right now. My main computer is broken.
Sorry.