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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 18.01
Operating system and version (eg, Ubuntu 17.04): CentOS 8
Apache or nginx version (eg, Apache 2.4.25): Server version: Apache/2.4.37 (centos)
PHP version (eg, 7.1): PHP 7.4.3 (cli) (built: Feb 18 2020 11:53:05) ( NTS )
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
Run: sudo -u apache php /var/www/html/nextcloud/updater/updater.phar
[ ] Verify integrity …PHP Fatal error: Allowed memory size of 2097152 bytes exhausted (tried to allocate 106552408 bytes) in phar:///var/www/html/nextcloud/updater/updater.phar/lib/Updater.php on line 637
Trying to run the command line updater and constantly getting the above.
If I try to use the web based updater I run the command and it gives me the secret string and the text sting, I paste the secret string into config.php, then I paste the text version of the string into the login box on the updater and it prompts me again to run the command.
So I am stuck, the command line version errors out by exhausting PHP and the web based updater does nothing.
Do I just format the VM and start over? Or is there a different option I haven’t found yet?
Also, when you run the command line updater it complains that there is a non-default directory of “log” and it won’t continue. But if you delete that directory, HTTPD won’t load any longer.
Im not sure how to get around the quandary I am currently in.