I was a long time user of https://github.com/mohsen3/CapsLang but eventually got tired of accidental language switches (it uses alt + shift combination).
So, here's a revised version for win 8+ that uses win + space combination since it's almost unused combination of them all (in other combination ofc xD).
Download the .exe file from the release section or download AutoHotkey and generate the executable yourseld and put in %AppData%\Microsoft\Windows\Start Menu\Programs\Startup.
I suggest disabling the alt + shift combination but it's up to you:
