t Logic Pro, the only reason I use this computer.....where is it? And why can't I download it again from "purchased"

Please help me re-download an app that I purchased....ugh. Got my Mac recently fixed, new everything from water damage, it came back without Logic Pro, the only reason I use this computer.....where is it? And why can't I download it ? where is it? And why can't I download it again from "purchased" list where it sits, staring at me. The purchase price shows $0 paid. Please help.