How do I update the copy of LinkMachine on my site to the latest version?
The copy of LinkMachine on your site is automatically updated to the latest version when a new version is released, at no charge. The list of updates with version numbers is posted here:
You can see what is the version of your site's copy of LinkMachine at the bottom of the admin page, below the Site List.
Note that if the current version number ends with a letter, that letter will not appear on your admin page; only the number part will. So for example if the latest version is "1.58d", your admin page will display only "1.58".