Still unclear as to what you did whether you actively downloaded the update or if it was pushed to you. i.e. you got a message to download and it automatic. If that is the case it is unusual you haven’t been informed of other versions since 2020. If that is the case then maybe you could state which network you are using that has only offered this one update since 2020??
What version do you think you had in 2020 that you think you downloaded an update to?
There have been a number of updates since 2020
Have you checked your memory? If it was a large download and you only have about 5Gb left the system may have crashed.
You could try and start in safe mode which would avoid installing any apps you have, that will free up resources.