funnily enough, now it crashes straightaway, saying:
Plug-in crashed: "gmic_gimp_gtk"
i'll reinsert the newer g'mic binary already tried and failed, obtaining the same error as before. it's a case of replacing whatever's within the appimage itself, but for that i'll need peazip or something similar. with that, i've run into another problem: dependencies - namely having to download thousands of them it turns out that i'm wasting my time given that i can't even use peazip to open it.
the strange thing here is that i was able to extract its contents manually before.