Can't uninstall D-Tools 3.47/install 4.0

[Vamar]

I'm trying install 4.0 and I choose the option to upgrade the older version, however, I keep getting the following error:

A network error occurred while attempting to read from the file C:\Windows\Installer\daemon.msi

Now I still have a virtual drive that I can't remove, and I can't completely uninstall D-Tools 3.47 or reinstall it. Any suggestions?

[Copytrooper]

Copy daemon.msi (should be in Windows\Downloaded installations folder) to that location and try again. Note that you require the msi matching the installed version!
Also check thread about error 25002 in common problems and solutions forum for manual removal procedure, reboot after the procedure.