[Revan]

Yes, you have to manually enter phpMyAdmin and drop those columns, and every other RPG table, then run the installer once again.
Alternatively, you can add a line of code before and after all the table queries:
Add BEFORE all $DB_site->query:

PHP Code:

$DB_site->reporterror = 0; 


Add AFTER all $DB_site->query:

PHP Code:

$DB_site->reporterror = 1; 


Then you can install fine without errors, it will install without stopping with an error.

The v3 installer will be able to run this "repair mode" as well, so all such errors will be history once I complete it