What file is macretinares.zip?

A Google search found that it seems to be a file that is downloaded with the Zoom.us application. Normally it self expands and installs before deleting itself. Haven't found what is in it.

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Hi Mareskuro,

I understand you had an unexpected file in your Downloads folder.

A .zip file is a compressed file format. You can learn more about compressed files here: Compress or uncompress files and folders on Mac.

It appears the MacRetinaRes.zip file is associated with the Zoom app, have you installed this recently?

Hope this helps!

Thank you for using Apple Support Communities.

Cheers.

Try this: boot into Safe Mode (How to use safe mode on your Mac - Apple Support) by booting with the Shift key held down and and delete the file from there.  Reboot normally and check to see if it comes back.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing some system cache cleaning, volume verifying and directory repairing. 

https://www.theverge.com/2019/7/10/20689644/apple-zoom-web-server-automatic-removal-silent-update-webcam-vulnerability

If you any questions please read the above. It is all for your own good it seems.

Best of luck.

I too cannot delete "MacRetinaRes.zip" from my download folder. Every time I delete it, it mysteriously reappears.

There is no reason to ever run any "cleaning", "optimizing", "speed-up" or anti-virus apps on your Mac. That includes bitdefender. This user tip describes what you need to know and do to protect your Mac: Effective defenses against malware and other threats - Apple Community   

Uninstall bitdefender according to the developer's instructions. You can check to see if you've removed all of the files by downloading and running Find Any File to search for any files with the application's name  and the developer's name in the file name.  For example for bit defender software you'd do the following search: 

1 - Name contains bit defender

Any files that are found can be dragged from the search results window to the Desktop or Trash bin in the Dock for deletion.

FAF can search areas that Spotlight can't like invisible folders, system folders and packages.