I have downloaded the Catalina update countless times. I have PLENTY of space on my hard drive and it continues to never accept the download and it won't notice it at all. It refuses to update it. I don't know what to do because a lot of things won't work if I can't update my OS. Is there something I am doing wrong?
MacBook Pro 13″, macOS 10.14
Try installing in a Safe Boot...
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.
Follow previous advise - First
Judging from the user's byline, the computer is currently running macOS 10.14 Mojave ?
Is Mojave the current version 10.14.6 ?
Have All the Security Updates been installed
At some point around Mojave 10.14.3 the installation may have asked you to Convert the Drive Format from HFS + Journaled to the newer APFS Drive format
Ways this done when asked ?
Starting in macOS 10.15 Catalina - the Drive Format Must be in the newer APFS format
It is possible the Installation of Catalina 10.15 is having issues converting the drive to the required new format
Refer to posting from @tbirdvet in link below
CONVERTING TO APFS - Apple Community
Mojave OS to Catalina OS update on old Macbook Pro (13-inch Mid 2012) isn't updating
