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I couldn't find it to download, I couldn't find it on my computer, I couldn't find it in the install package.
What I ended up having to do is reinstall Crystal. Completely. But, when I got to the screen asking if I wanted the typical or custom install, I didn't click next. Instead, I went to the temp directory it unpacked to (as you can see above - it's C:\Users\UserName\AppData\Local\Temp\) and sure enough, there's a RarSFX1 folder there, which gets deleted upon install. I copied that folder to my desktop and proceeded through the install.
Then, when I got back to that error message, I simply pointed it to my desktop, which had the RarSFX1 folder (with the CrystalReports.msi inside) and it took it and let me install the rest of the way.
What a mess. SAP really needs to fix this issue, but even though I'm not the only one with the issue, they've not posted any fixes or instructions. Needless to say, this RarSFX1 folder is getting zipped and saved on my hard drive (as well as backed up offsite) in case I need it in the future.