An upgrade to One Man Band v12 from One Man Band Originals or On Man Band V11 costs USD 12.50.
Send a message to JosMaas@1manband.nl that you wish to upgrade to One Man Band v12 and specify the name, post address and email address that you specified when you registered for the previous version. After this info is checked you will receive info on how to proceed. No matter what your previous version was, you can buy the upgrade both for Windows and Macintosh for USD 12.50 each.
No need to uninstall your previous version of OMB before installing the new version, each version is installed in a separate folder.