mpTrim PE is a registered version of mpTrim.
mpTrim PE is based on mpTrim freeware, with the following improvements:
mpTrim PE's registration fee varies from $19.95 to $35.95, depending on the options you choose.
If you want to register or simply get more details on the options available, proceed here.
Registering entitles you to one year of free updates. For details, check here.
mpTrim PE doesn't introduce a new version numbering scheme. Instead it follows mpTrim freeware version numbering, even though not all version of mpTrim freeware will have a mpTrim PE equivalent.