Store sold me a serial number for v3, but I need v2

How do I get the store to send me a v2 serial number?

I can’t install the v3 software at this time, as my OS won’t support it and I cannot currently upgrade my OS.

Download the 2.9 version. It will work with a v3 serial number. Get it here:

Woo-hoo! That worked. Thank you.

BTW - When I can eventually upgrade my OS, can I still license v3 with this same serial number?