Purchase Premium Roles 0.1.6b
The plugin supersedes Premium Accounts
which will no longer be actively developed. You cannot run the two together. However it will still expire those that are on upgrades. The transaction log will not be imported.
PurchasePremiumRoles is made to work with the Marketplace plugin:
This has many benefits namely you aren't limited to a single upgrade product, and you can have different payment options that Marketplace provides.
Set up your product(s) through Marketplace
Then you should be good to go.