Why do I keep getting error 108

I have the old CIS 3.8 and to update it but it gave me an error 108. why do i have this?

3.8 is incompatible with the new update system. You’ll need to download the installer and upgrade that way.

so then i have to uninstall it and then reinstall it or can i install the new version over the old one? and if i uninstall it is revo uninstaller in advanced mode good to get rid of everything? thanks.

Yes, it would be a good idea to uninstall first. And yes, Revo is a good choice.

Edit: Just remember that after uninstalling CIS is going to ask you to reboot. Don’t do that yet or Revo won’t be able to scan for leftover items.