Hi Meganroth,
Sorry for the trouble.
Please try once to run the cleaner tool Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs and reboot the Mac.
Then install the latest version of the Adobe Acrobat Reader DC from here Adobe - Adobe Acrobat Reader DC Distribution
Check if that helps,
If you are still not able to install the application, try the troubleshooting steps provided in the following help document.
- How to resolve Acrobat Reader download issues
Let us know how it goes.
Regards,
Meenakshi