Hmm well that’s hard to say. Initially it is not very difficult to build an AppImage, but the problems are in the details. There were various nasty bugs in the tooling which in the end cost a lot of time, probably easily >50 hours over the past few years. However, all the other packaging methods have their own problems too and cost at least that amount of effort.
But this is now really off-topic here. For questions not related to simulation, please open a new thread or ask in our chat.