I just tried to update to the new MP, and it gives up because my PC isn't compatible. However, it did this AFTER it removed and updated some of the packages, thus breaking my install. Thanks MediaPortal, that's fantastic.
Re: Please put the system requirement check BEFORE deleting/updating existing MP inst
If you give some info on the versions you were upgrading from/to we could actually try and do something about it. Are you sure MP didn't backup your settings?