I bought a new computer, but the JMP app won't install on my new computer. Do I need to uninstall JMP from my old computer before I can install it on the new computer?
There should be no need for that.
Try to run the installer as "admin" via right click -> run as administrator.Different to many other installers, the JMP installer doesn't ask for admin rights - and it doesn't show a warning that admin rights are missing.