SimsStudio can't find the Sims folder + problems w/ fixing

Hi guys! I downloaded some mods and it always worked pretty well since the last big origin/ea update. I can't put tables, desks and counters into the sims world. So I decided to download Simsstudio. When I open it, it says that it can't find the sims 4 folder but somehow the correct folder is shown in preferences.. As well, I tried to fix some batches and they all worked out good - except the counters, tables and desks - they still don't work. As well, now I have problems with the hairs - I can't use them anymore and lots of mods I've installed are gone.

so my questions

1) why is lots of stuff i've downloaded gone and where do I find it?

2) how to fix the problem with the table etc. and hair?

3) why isn't simsstudio able to find my folder even when some of the batches I fixed are working now?

thanks in advance and sorry for my bad english :-D

all the best to you and merry christmas btw!