Is anyone else having issues with using custom content after Seasons? Even the stuff I create I can’t use so I haven’t been able to upload anything new, it just gives me an error code when I try to play families with custom content.

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Is anyone else having issues with using custom content after Seasons? Even the stuff I create I can’t use so I haven’t been able to upload anything new, it just gives me an error code when I try to play families with custom content.
Me: Oh hey! Let’s install all this awesome custom content right before an expansion pack and major patch.
*Game won’t load*
Me: Okay then.
*Off to check which piece of content is the problem child*
Just spent the last hour cutting the fat from my mods folders, at least from the CAS items. I still need to do the build/buy items, but those are a little harder to get rid off because I have no way to know what shit is called in the folder since not everything is clearly marked. If I could get the damn TS4 package viewer, I would be able to see what isn’t clearly marked, but I cannot seem to download it. It’s on a website that’s in Cantonese or Mandarin or something of the like, and I only speak English so I have no clue how to maneuver the site. I think it might need a registration even, I am so not sure.
I KNOW YOU CAN READ THIS, SIMMERS HELP ME...
I only use .sims3packs for custom content because mods/.packages crash my game...So I went and downloaded a shit ton and none except for the ones that came on downloaded sims are showing up. Help, PLEASE!
I really want to play with custom content, seriously help I need to know what's wrong. I'm begging please.