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Here's the dark theme again, just rezipped it with a revised folder structure. Put into C:\Program Files or put the contents of Deluge into your portable folder.

Deluge2-Dark(Mantis-theme).zip

If you're switching to a NSIS installer, wouldn't it be as simple as making it a checkmark option within it to add it?

Oh, I guess now that you're not calling the directory Deluge2 you'll have to adjust the path, but other than that, my archive works out of the box.

If you can't stand light themes, here's a Dark theme for this package, extract to C:\ https://anonfile.com/iaq9ccB4nf/Deluge2-Dark_Mantis-theme_zip Did this go unnoticed? I was hoping it would be added to the installer. Oh, and I suppose the portable too... though, with you having to post two versi...

If you can't stand light themes, here's a Dark theme for this package, extract to C:\

https://anonfile.com/iaq9ccB4nf/Deluge2 ... -theme_zip

Does your username have non-English characters in the path? Either way, try --config %appdata%\deluge and see if that makes a difference.

I don't understand why you don't just have C:\Program Files\Deluge2\gvsbuild\release\bin added to the PATH env variable for the session, it should be rather trivial and doesn't make any permanent changes, only affects child processes. It is essentially the same way Linux handles env variables.