I have tried to upgrade SuiteCRM 8.0.1 to 8.1.2 using the following command:
./bin/console suitecrm:app:upgrade -t SuiteCRM-8.1.2
However an error was generated:
PHP Parse error: syntax error, unexpected ‘:’, expecting ‘{’ in /home/hermes/public_html/vendor/symfony/polyfill-php80/bootstrap.php on line 23
I created and used a phpinfo test page to confirm SuiteCRM webhost was running a supported version of php.
However I did not check the version of php the shell was using to run the upgrade script. In my case the shell was using a different and old version of php which generated the errors.
I updated the version of php the shell was using to 7.4 and then the upgrade script completed the upgrade successful . SuiteCRM appears to run OK with the limited testing done so far.