If you helped beta version 5, then you should also have received the released version 4.5 for your help (as it's detailed from the link to those forums you gave). The only legal version now is the paid version 4.5. Version 5 doesn't exist as free anymore. If you upload version 5, then you'll have a version made illegal since the beta period was done since the development of that version has already been done with months ago.