Some time ago (few years) I searched for portable windows build. There's one, at PortableApps, but that's what I found now: https://portableapps.com/apps/development/geany_portable
What I found previously is for version 1.24: with filename GeanyPortable_1.24.paf.exe I don't remember where I got it that time, so I assume it has same source, although I never used it. I searched it mainly because learning in university, where machines use windows, so using portable version was the only way in case of need to get geany on windows for some reason. But it so happened, that I never had such need (just carried laptop with myself).
Now I went across this file and decided to check for updates. What's interesting - publisher is named 'Geany Team', with url leading to geany site. However, I found no info, leading to portableapps, at download page, github tracker and users mailing lists (though I did not check other lists yet).
So question - can that publisher be trusted, is it really related to geany team?