I want to try an alpha release of the Roboto Slab font to troubleshoot an issue in LibreOffice. No matter what I do I always get a prompt like this for every *.ttf file:
The 'Roboto Slab Regular' font is already installed. Do you want to replace it?
Since I'm already having issues I want to ensure the old files from any Roboto-like font are totally gone from my system and I can't figure out how to make that happen:
I originally installed the fonts with SkyFonts so I removed it using the app and then uninstalled the app itself.
nexusfont still displayed Roboto so I removed it from that app.
The font was still showing up at
C:\Windows\Fontsso I removed it using Windows explorer.
Then I realised that I still had
C:\Windows\Fontsthat were not visible from explorer so I removed them from an elevated command-prompt; I double-checked with both PowerShell and cmd.
Meanwhile, I've restarted the computer several times.
The font does not seem to be available any more (LibreOffice documents display some fallback font) but, when I want to install the alpha, I still get the font is already installed dialogue.
How can I ensure a given font family is complete removed from my system to all effects?