This looks like the same problem that you reported with the MEX files of the MEM toolbox:
The problem is most likely not DUNEuro or MEM but your operating system. You operating system can't execute some of the compile code, maybe because of rights limitations. Examples of problems: the OS doesn't want to execute the binaries for safety reasons, you have another program blocking them, you are not an admin, you don't have execution rights on these files...)
You reported that things worked before. If you have updated your version of MacOS recently, the problem could be the additional restrictions Apple impose on the execution of programs that were not approved explicitly by Apple.
You might find your solution in the following post:
Since you were recently asking about software recommendations:
MacOS might not be the most recommended operating system for research. Research software is often more complicated to run on MacOS. Consider using Windows 10 or Ubuntu instead.