Hello Owen,
Once you've run a newer version of Hauptwerk you won't be able to run an older version unless you completely uninstall Hauptwerk, selecting the option in the uninstaller to remove all files/settings. You would then be able to re-install the older version.
Note also that you would then need to use "
File | Install ..." in Hauptwerk to make sure you have the Hauptwerk licensing packages installed:
https://www.hauptwerk.com/licensingpackages/You should then be able to reinstall your organs.
If that doesn't solve it, please use "
Help | Create a diagnostic file" and send the resulting file to Francois at
support [at] hauptwerk.com ... so that he can see the actual error message(s) that you're getting, and what you did leading up to them.
Thanks.
Best regards, Martin.
Hauptwerk software designer/developer, Milan Digital Audio.