PommO does not work out of the box on PHP 5.3. It fails with an error:
"Deprecated: Function set_magic_quotes_runtime() is deprecated in bootstrap.php on line 56"
You can fix this problem by commenting out the function call on line 56.
Everything then *seems* to work ok.
However, PommO appears to not be supported any more. See comment on SourceForge (I can't post link because I'm new here). There is a new fork of Pommo that is supported - are Softaculous going to switch to that?