In macOS 10.13 (High Sierra), Apple started warning users about 32-bit applications by saying those applications were “not optimized” for their Macs. The warnings continued in macOS 10.14 (Mojave). Starting with macOS 10.15 (Catalina), 32-bit applications will cease working altogether.
Hopefully, vendors still producing 32-bit applications for Macs will get their acts together and create 64-bit versions soon.
In the meantime, you might want to check your Macs for what 32-bit applications they have installed so you can pressure vendors to update their apps, start looking for 64-bit alternatives to those apps, or consider whether you even still need to use those apps.
Checking for 32-bit apps on an individual machine
I’m not sure how useful this would be to Mac admins, but you can check for 32-bit applications on a single machine by going to System Information.app
Then scroll down on the left side to find, under Software, Applications.
It might take a while for the list to load.
Once the list is loaded, you can sort by 64-bit (Intel), and then sort again, so all the No entries are at the top.
Checking for 32-bit apps for multiple machines via MunkiReport
If you’re using Munki and MunkiReport, you can go to Listings > Applications to see which apps in your fleet are 64-bit or not.
If you want to query the MunkiReport database directly, you can also run
FROM applications
WHERE has64bit=0
ORDER BY name, path
Acknowledgements
Thanks to eholtam and gmarnin on the MacAdmins Slack for pointing me to the right place in MunkiReport.
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