Thanks for pointing those things out. I'll fix them up as part of next release.
I never used to include a Linux install script (it's only been there a couple of weeks) and forgot to update the read me file after I added it.
The chmod +x should not have been necessary so there must have been a problem with how I created the zip file.
When I make a new release I copy all files from Linux to Windows so I can do the Windows builds, and then produce the zips for all platforms from there, so I think the file permissions are getting lost along the way.