Please clear your browser cache, then re-download the installer from here: gpsoft.com.au/DScripts/download.asp
Check the digital signature on the installer to make sure it has been fully downloaded and hasn't been changed at all.
If all is well with the download, installing that should fix both problems. (Unless something like an anti-virus tool or full HDD is blocking the new files from being written.)
If prompted at the end of the install, be sure to reboot.