If the program you need, needs to run on 10.15 or newer, make sure you have:
MacBook early 2015 8,1
iMac Late 2012 12,1
MacBook Pro Mid-2012 9,1
Mac Mini Late 2012 6,1
MacBook Air Mid 2012 5,1
Mac Pro 2013 6,1
where the x,y after the machine name year is the Machine ID as it appears in Apple menu -> About this Mac -> System Report -> Hardware.
If your Mac is older, you'll need a newer Mac to use 10.15 or newer.
Also make sure all your applications are 64 bit compatible and read this tip:
https://discussions.apple.com/docs/DOC-250001761