litteraly just follow BROHONKY's guide lol, enable the un-remastered vertigo beta

Here it is - https://sp.zhabite.com/steamstore/app/465430/Vertigo/
Get it for free, then download
(If the game link isnt loading then go from the soundtrack page to the game page itself)
https://sp.zhabite.com/steamstore/app/526860/Vertigo__Original_Soundtrack/

Go into the vertigo remastered folder and copy "vertigo_data" and "Vertigo.exe"
Paste them into your vertigo demo folder
Rename the pasted in folders the same as their demo counterparts, so for example change vertigo_data to Vertigo-Demo_data and then delete the original files so only the ones from vertigo unremastered (with their demo names) are there
After that, launch the demo and you should be able to play the OG game with working bindings from there!

probbably because its using vertigo remastered bindings with vertigo 2016 which doesnt work with them, you might be able to take only the bindings from the demo version and paste them as your vertigo remastered bindings but i doubt that would work