If you're looking for a specific title from the 51-game list that isn't on mainstream stores, check Internet Archive's software library, which often hosts "abandonware" versions of classic casual games for historical preservation.
This is currently the most "complete" way to access the collection. A subscription usually includes the vast majority of the classic PC library. Download All 51 Popcap Games Collection Pc --BEST
If you spent any time on a PC in the 2000s, you know the "PopCap sound"—that satisfying If you're looking for a specific title from