While you are renting Serum 2 through Splice, you must have the latest version of the Splice Desktop App installed. You can download it here: splice.com/download.
System Requirements for Splice Desktop:
macOS: 10.15 or later
Windows: 10 or later
Additionally, during your Rent-to-Own lease, the Splice Desktop App must be opened at least once every three days to verify your Serum 2 subscription.
This also applies if you are on a Serum lease and using Serum 2.