I was going to install this and check for issues but I didnt even get as far as you and for me the installer fails within the first second with the error message
The following errors were found :
The email address is not valid.
but my email is correct, something is wrong and im unable to test
I just tried to install osCommerce myself, and it worked for me. It wasn’t exactly smooth, but it worked.
Can you please go into the file manager and clear out the installation directory for your website (probably htdocs) before trying again? It may be that there are some residual files from previous failed installation attempts causing problems for the new installation.
That’s because the defaults in Softaculous don’t seem to completely correct. There are a number of fields that are pre-filled, including (I think) the owner email. But that just contains owner, which is not a valid email address. You manually need to set that to an actual email address to be able to install.