I am unable to make any of the weapon upgrades or proving grounds items.

many others, including me have no problems with this version.
So please provide some informations.
subscribed the mod?
activated the mod?
are the options showing?
what other mods are activated.

no one can debug something with just "it's not working"

subscribed and activated. idk what you mean about the options showing. and do you want a list of all the mods i have active or is there a specific type of mod that might make this not work?

The complete.
No incompabilitys are known.

I mean in building Item aka engineering See also the Screenshots in the Project. Does it look like that?

no none of that is showing up. it was working for me a couple of hours ago so idk what happened and my mods that are downloaded and active are:
better laboratory
scientist staff slots
better tactical zoomout
im the commander here
peek from concealment
new promotion screen by default
overflow ability points
fair lost targeting
loot pinatas
extra weapon upgrade slots
disable timers for WOTC
all soldiers gain xp
mod config menu
show health values
evac all
timer tweaks for WOTC
ultimate workshop reloaded WOTC

and I know how its supposed to look the mod is active and im subscribed to it. the items just dont show up at all in the engineering > build items screen.

maybe you're a victim of that old bug:

The issue where the added items this mod adds to Engineering's "Build item" menu disappearing is a bug that was also present in the original mod. And the workaround was simply to exit and enter the build menu over and over until the items get loaded again.

ok ill try that

ok so that didnt work but i went on a mission and after i returned it fixed itself ¯\_(ツ)_/¯

I think I found a bug. (or already known bug except me. cuz I'm new at this mod.)

Gas Bomb, Acid Bomb and Incendiary Bomb will not show up on the list, even if I finished my Advanced Explosives from Proving Ground.

However, already has ones upgraded properly, though.

they are in the code that's all i can say for the next 12 hours since im at work and it's not that of a godd idea to load xcom2 on a Buisiness Laptop.^^

You don't need any Researches with this mod, it should be free to build from the beginning.

I completed "Bluescreen Protocol" in PG and built one EMP grenade via the Workshop but I do not see it among utility items when equipping my soldiers.

It is also known that grenades built through Workshop will not become bombs. Is there a way to fix it?
Maybe I should install UW Revolutions: Experimentals alongside this mod?

Never made any changes to this one, just recompiled it so it won't f*# up WotC
Crypto never had EMP Rounds in it.
Regarding the other Mods: im trying to clean everything up in the next weeks to make it easier for someone who want's to take over do so.
i can't motivate myself to work on them.

I re-loaded my save and everything is fine now. Might have been a glitch.