An emergency fix for Linux, as it looks like that 1.7.0 is not loading there. Thanks for a quick report!
The other change is an attempt to eliminate some strange crashes I’ve not been able to reproduce on my machine.
Single installation supports all installed Mayas, thanks to the new way Maya discovers it's plugins.
For each platform, there are two downloads - installer and a plain .zip archive. Use installer for automatic setup, or .zip if you need more control over the installation.