Yep, all installed and running.
One MPS 2.1 serial in my account. Doesn’t say upgrade or crossgrade, just says MPS 2.1 and I’m thinking the serial you get registers anyway, whatever’s in your account that may or may not qualify. In the end, though, if they would check later on, I guess you’d better be sure to live up to whatever condition the reseller states when you purchased, which, in JRR’s case, is owning an advanced iZotope product.