macos executable download issues

[thautwarm]

purescripto/purescripto/installer.py

Line 107 in a230626

matcher = re.compile('\S+' + re.escape(plat_name))

so far the release is built from travis ci osx 13, however it seems to work on later versions.
@lfkdsk I hope you can refine this piece of code to properly support multiple versions of macos..