License expired error EC 204

I am trying to play my game in offline mode but it is stating to me license expired error EC 204. It is asking me to update the game online. If I did so I will lose months of hard work i put in to change my hundreds of sims hair , clothes etc using downloaded items . I would also have to download again all the mods .. last time origin forced me to update sim  i lost everything.. in order to avoid that happening I have been playing my game in offline mode but now it is not letting me play it in offline mode anymore .. I read in forums to delete the origin app and download the ea app .. I have done that with no benefit .. i will really appreciate EA or someone to support this issue .. I feel a lot of people will stop playing the game without mods if whenever the game is updated all the sim cloths that we downloaded from the internet vanish  and all the mods have to be downloaded again as well…  can you please tell me how i can continue to play this game offline