Just go to the Help menu in Black Magic and select “Check for License Update” (or something very similar as my BLAM doesn’t have that.)
You’re on the 3 payment plan. As such, your license expires about five or six weeks after a payment is made. When we get notified of another payment, we generate another license file that’s good for another five or six weeks. You then do the “Update License” thing again and you’re good to go.
When the final payment is made, the expiration date is set to the year 2099. (Due to the way the licensing software works, we can’t convert from an expiration date based license to a perpetual one other than setting it to expire almost 90 years from now.)