You can copy the app on flash drive and drag it over.
If you have templates and specific key commands you have to copy those from the user library and preferences folders.
No, it is not. Control-B will always give you a stereo bounce.
The Bounce button gives you a mono bounce if the track format button is set to mono like explained earlier.
Definitely online at the Apple Store.
You can also look at refurbished Macs at the Apple Store online:
https://www.apple.com/shop/refurbished/mac/macbook-pro
Try deleting the audio units cache manually:
https://acusticaudio.freshdesk.com/support/solutions/articles/35000146023-re-setting-the-logic-pro-x-plug-ins-cache-manually