If you want to retain your account age, you also have to replace the keys directory of your new installation with those of the old installation, see this topic:
Quite honestly, I don’t get why you want a new installation. Unless there is a problem with the old one, I see absolutely no reason to make a new one.
Edit: Forgot the part about the app freezing with the old installation. But as it seems to be working again, I would forget about the second installation and focus on the old one.
Also, the two installations do have different data directories, right? Could you post their full path?
As for the block downloading issue, it would help to know what your status bar at the bottom of the application looks like. Do you have Bitcoin network peers and Bisq P2P network peers?