nope, everthing seemed fine when i tested it (somtime between your question and this answer) - maybe check the last picture, possible mod conflicts or problems with the steam workshop.

btw. sry 4 the late reply i apparently wasnt subscribed to discussions

what are the mod conflicts? what mod don't this mod not work with?\
it not appearing for me

have you checked the last picture? - if you're missing the blueprints, there are several mods which remove the merchant - like the popular genesis mod

how often the Hub dude sales blueprints. in my game there's only an item from another mod

with just this mod, there are all blueprints available after an refresh of the vendor. Thus at the beginning of the game or every 3 days or so.

This mod adds the blueprint cleanly to the vanilla vendors inventory. However if another mods exchanges the merchant or the inventory-list completely, you wont find the blueprints there. If it is just the Merchant: the lone shack has the same inventory list. If the Item list is replaced, it will be replaced at the lone shack aswell, leaving only research options