[2020] Launcher Error

Try deleting the entire contacts of that C:\windows\installer\ folder ; not the folder itself, just its contents. They are all temporary files.

To see that folder you'll need to enable View Hidden Items in File Explorer.


If it is not there however, try creating it manually.  

It is a folder used by the Windows installer app msiexec.exe for temporary installation files. I've recommended many people delete its contents (NOT the folder itself) with no repercussions.

But is it there, did you find it?