[jitsi-users] How to uninstall Jitsi?

Hey everyone,

I've problems upgrading/uninstalling Jitsi 2.4.4997 under Windows 7 x64.

When I try to uninstall it in the system settings, a window pops up and says:

"The feature you are trying to use is on a network resource that is unavailable.
Click OK to try again, or enter an alternate path to a folder containing the installation package 'jitsi-2.4.4997-x64.msi' in the box below."

I've downloaded the file again from https://download.jitsi.org/jitsi/msi/ and put it in the correct directory.
When I click OK, it tells me: "The file 'C:\Users\Marian\AppData\Local\Temp\jitsi-2.4.4997-x64.msi' is not a valid installation package for the product Jitsi. Try to find the installation package 'jitsi-2.4.4997-x64.msi' in a folder from which you can install Jitsi."

(The file "jitsi-2.4.4997-x64.msi" is actually in this directory of course)

Being unable to uninstall a software is really annoying.

Can anyone help me out?

best regards