guys I install samourai dojo and work fine!
at this point I try it in 3 computers and each time I get that same stuff, I can't choose a different directory for the blockchain!
is a bitcoinQT wallet problem that's for sure!!
Glad to see the problem resolved (in unexpected way), but i doubt Bitcoin Core is the problem since i don't see other user make report and i can change directory using Bitcoin Core 0.19.0.1
P.S. i see samourai dojo enforce Tor connection, hopefully you can be patient with slower connection