When I try to launch the installer I get the error "Cannot open file C:\Users\agare\Documents\GOG.comDownloads\silver\setup_silver_1.0.0.9.exe.". I have tried launching it as admin, I've tried renaming the file to add .exe at the end, I've tried to download it with a browser aswell as with the GoG downloader and now Iam running out of ideas on how to fix this.
Please help!

Pic is the error message.