Re: Spore won't install on my Mac OS Catalina (Version 10.15.3)
@HeyItsLavender Sorry, but Spore is a 32-bit game, and Catalina is 64-bit only. There's no way to run Spore in Catalina, nor is there any indication that EA will release an updated version.
At this point, your only options are to play on another computer, to install Windows on your Mac (via Bootcamp or Parallels), or to install an earlier version of macOS on an external hard drive or USB and boot into that when you want to play. For the last option, you'd need at least temporary access to a Mac that hadn't been updated to Catalina yet. And in all honesty, I'm not sure it would even work—Spore seems to not play nice with newer Mac hardware.