The current version of Audacity can read both .AUP and .AUP3 files. If you have only the older .AUP projects (and associated data directories) you can load 2.4.2 from here: Old Audacity versions download
The current version of Audacity can read both .AUP and .AUP3 files. If you have only the older .AUP projects (and associated data directories) you can load 2.4.2 from here: Old Audacity versions download