How to upgrade license from 2015 student license

[dailymc1]

Hi all,

Whilst at Uni (finally) completing my MA, I purchased the 'FOR LIFE' Pro Tools license. However, as you can see from my kit list, altho my 2008 Mac Pro is quite fast enuff to run my studio, as I refused to play the 'Upgrade Wars, I finally had to make the plunge, as I couldn't upgrade my OS (last one was El Capitan... frustrating as my machine is well capable.. Apple ay!?) & so therefore, new software AND hardware!?
And so, have bought a 2019 iMac, & a UAD Apollo audio interface, wiv the new iMac running Catalina. However, my 'LICENSE FOR LIFE' won't work...
Please advise

Many thanks

Paul aka; DailyMc