If you're an administrator for JMP, you can now request installers for JMP 13.1 and JMP Pro 13.1 from jmp.com/upgrade.
These installers will allow you to install JMP 13.1 directly. If you would like an updater to update and installed copy of JMP 13.0 to JMP 13.1 you can find those at jmp.com/update.
-Jeff