In all cases the ETTraceRunner executable tries to write its output to this particular folder. Depending on the installation method, file system permissions, etc., this directory may not be writable.
It would be nice to have an option to set the output filename or at least output directory.
It might also make more sense to use the CWD as the default output directory, rather than the binary's install folder.
https://github.com/EmergeTools/ETTrace/blob/27d92ce82e3306b4abd84661cf02826bcaefb0c4/ETTrace/ETTraceRunner/RunnerHelper.swift#L67-L68
In all cases the ETTraceRunner executable tries to write its output to this particular folder. Depending on the installation method, file system permissions, etc., this directory may not be writable.