I am gonna be honest and say that I am really pissed. Why didn't you check the last seasons configs and plugins? I & @Mahdi717 made the season supper modern and everyone liked it that way (Faction Incognito Owner), now I see this big old retro look on Factions and I honestly facepalm... I like that you have done a lot of stuff to get this far, but jesus christ you fucked the last season Over... Also, I have seen player shops in 2015 Prison servers. Factions has no need for these shops anymore as I can just go in a players shop and nuke it with ceggs, take the stuff & run.
Sorry but you'll have to buy it again. As I don't know anything about that. I didn't check the last season, because this is my own season, my chance to make it work.