Windows Installer checks for any GTK app, not only Pidgin
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deckrider
The installer reports: "Pidgin (or another program incompatible with this installer) is running. [...]".
It took me some time to figure out that ALL GTK-based software has to be shut down and then it took me some time to come up with the fact that Workrave is a GTK application too.
The installer should check for something more specific.
Or at least notify to close any GTK app.
Mine were Ekiga and GIMP.