After full installing of BIAB Mac 2021 do I need to keep old installations.
While as a general rule of thumb, it is best to install the new version over top, there are exceptions where you don't have to if you're installing to a new computer drive. If you contact us directly, we can let you know whether or not you need to install over top of your previous, based on your order history. You can contact us either on live chat during our open hours, or email sales@pgmusic.com