Hi, I bought BIAB ultrapak+

I installed everything the right way,

what happened is that the finder began to be real slow, up to the point that it became totally unusable.
thought it had something to do with mojave so upgraded to catalina, it did the same thing
I downgraded to mojave again, it did the same,

so bad that I had to reinstall my computer from scratch as it it was brand new ( my computer is brand new btw, it's a imac 27inches bought in october, 1to ssd, 40 gigs of ram)

I did a partition on an external hard drive cloning my system, installed it on the clone , same happened

SO I don't know what's going on but I'm really not satisfied at the moment especially paying all that money for something that messed up my computer.
hope to get some help.