If you happen to find an old 2013 license key in an old email or on a forum, it may not work on a modern PC for several reasons:

Versions of these games are frequently found on Google Play or the iOS App Store under a "Free-to-Play" or "Premium" model. 4. Security Advisory

Related search suggestions (If you'd like, I can generate search-term suggestions related to legitimate stores, specific 2013 Alawar titles, or preservation resources.)