If you paid $80 then you purchased an upgrade license from a previous version of LR. The license from a prior version is what it’s asking for. You should have purchased a full version of LR not an upgrade if you’ve never had LR before.
You’ll need to talk with Adobe, directly, to correct the situation. I’d suggest doing a Chat which with Adobe rather than posting to these user-to-user forums.
I just purchased the license for Lightroom for $79
You've inadvertently bought the upgrade version. You should have bought the full version which is $149.
Return the order Return, cancel, or exchange an Adobe order Then buy the full version.
You can use the trial version for free for 30 days while it's sorted out.
Thanks very much. I didn't see the full version on there anywhere but I'll look again.