Hi Andrew-thanks for the reply ;-)I could not find " Then, sort by Set number column", but never mind-looks there were no error messages. Actually the problem started earlier than that point when I tried to reinstall Real tracks 1-45. Then it took too long again and I tried to cancel the installer, but it did not want to do so and the machine froze.So I restarted it and it got crazy...I restored it from the time machine and after I tried to install the RTs 046-101 and it did not happen at all. So that's how I come to the forum with that question...I was not sure if the Real Tracks were updated for Catalina. But no worries-now it looks fine and if something wrong will happen again, then I'll make a clean install and start it from the scratch.
Thanks for the answer and take good care for yourself and the loved once