DivinylsFan Saved CASt patterns are stored in UserPresets.package.
I would suggest not using the Smooth Patch's .package files, as they're not compatible with NRaas MC and have other issues aside from that. They won't break your saves, but you might see some crashing or other anomalies. And the MC compatibility package has been removed because it didn't work. The Smooth Patch files that go in Bin are fine to use and are independent of the .package files.
If you use NRaas ErrorTrap, it's normal to get a scripterror or two every time you load the game. That's typically just ET telling you it did its job. I wouldn't even bother reading these files unless you see other signs of trouble.
Here's a description of everything in the user folder:
https://sims3.crinrict.com/en/2011/01/faq-user-files.html
As for updating your NRaas mods, you don't need to do so; the previous versions are just as compatible with patches 1.67 and 1.69 as the current ones are. But if you do decide to update one mod, check for updates to your others too—you might as well update them all at once, among those that have updates.
The one exception is ErrorTrap, which needed an update to match the update to patch 1.69 that EA released two weeks ago. If you're not on patch 1.69, this has no effect on you, and you're not using the version of ET that got updated anyway.