Reactivating Capture 7 for capture only

Hi, I am on monthly subscription with C1 v22 at this time on iMac. But since recent Mac OS and Capture One updates, I am no longer able to shoot tethered with my Credo 40/Firewire800 cable, nor can I shoot with my older Leaf Valeo back. Thinking my only solution is to resurrect an old G5 tower for capture only, unless someone has a better solution. I've paid and used C1 for about 20 years. Started well before the subscription era. Purchased and own older versions of the app. However I don't have the old key/license numbers in my files. Is there a way to make this wok? To use my perfectly functional backs at this time? Is there a way to retrieve and activate the C1 v7 again? Thank you.