The source\ctmouse\tasmmasm directory contains the same executable in bin directory. The duplicates should be removed.
The binary package contains too many directory levels. There is no point for DOC\CTMOUSE and SOURCE\CTMOUSE directories when DOC and SOURCE directories do the job.
The fun is that this executable is made with MASM while the other is made with JWASM. It took some effort to get both byte-identical :-)
Regarding the directory structure: This is for FreeDOS support. If you install different tools into the same directory, their docs will end up in DOC/CTMOUSE and DOC/MYTOOL and DOC/YOURTOOL etc :-)