The MOTU public objects error is generated when an older version of MAS is
being used with a version that does not support it or if there are multiple
copies of MAS on the system. The best thing to do would be to do a search on
your hard drive for MOTU Audio System and trash whatever you find.
The modified resource error means that something has changed within the
version of DP 3 that you have installed on your system. The way to fix this
would be by deleting the version of DP 3 that you have installed.
Once both components have been deleted from the system, reinstall the MOTU
Audio System and Digital Performer 3. Once that completes, run the updater
again.