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When I navigate to Settings - Plugins the "External command Plugin" is not there, although I requested it upon installation.
As it turns out, restarting the PC (Windows 7 x64) fixed the issue. MS Paint got installed by default, and I added Photoshop which works like a charm.
Maybe a message upon installation that restart is best practice would be helpful to others encountering this issue.
Normally a restart is not needed, as you can't install Greenshot while it's running and it's started after the installation.
This is the first time I hear of such an issue, there must be a glitch.
What can you tell me about the version you used, and how you installed Greenshot?
Windows 7 64 bit and downloaded right from the website. Latest version of Greenshot.