EA's casual gaming site often features PopCap titles that are free to play with ads. Technical Note for 2021+ Downloads
As the current owner of PopCap, EA offers Zuma Deluxe for purchase or via their EA Play subscription service. zuma-deluxe-full-version-gratis-download-2021
If you are looking for the classic experience without a purchase, consider these legal alternatives: EA's casual gaming site often features PopCap titles