Audacity audio recording and editing software supports many audio formats for export, including AIFF (Audio Interchange File Format), and as such is your best and only choice for performing AUP to AIFF conversion, because it is unlikely any other software is otherwise capable to work with Audacity project files (*.aup). You can download the program for free, it is open-source.
Convert Audacity project to Audio Interchange File Format.
We have found 3 software records in our database eligible for .aup to .aiff file format conversion.
Microsoft Windows software - convert aup to aiff on Windows
A free, open source software for recording and editing sounds
Convert from aup file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned aup to aiff. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert aup to aiff on OS X
A multi-track audio editing tool
Linux/Unix software - convert aup to aiff on Linux
Multi-track audio editor for Linux