iMac 21.5 inch late 2013Typically if software doesn't work, it's due to being incompatible with Catalina (i.e. old software).
There is an internet recovery that will reset to default with the latest OS it can do. Please confirm the machine you have by going to the Apple icon on the top left and then click About This Mac. We will need the model name (i.e iMac late 20xx)
iMac no windows late 2013
Apple has a very narrow window in which you can reset your software. Log onto your Apple account. Now look for downloaded programs and see if your last OS Version is listed. If it is, you can download the OS and reinstall it.Catalina 62 bit prevents many apps working either need uninstall Catalina or reset to factory settings
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