You might want to try disabling UAC.. I have mine set one click below the W10 standard.
Make sures Bandlab is allowed both back and forth throgh your Firewall(s). If you use multiple Firewalls get rid of all but one. Make sures Bandlab is allowed through it.
Also when trying to install minimise everything to see if there are any hidden error messages/windows. If so what ?
Create a new user account - did that work ? Your old account may be corrupt.
Sorry if this is all repetition, i am late to the party.
Good hunting,
Jerry