true to disable the automatic checking and disallow the manual checking for new program versions by hiding the corresponding menu items Help|Check for New Version and Help|Check for Latest Build. You should only turn this check off for network installations where SmartGit users may not be able to perform the update themselves. When settings this option, you will probably also want to hide the corresponding page from the Preferences, using smartgit.preferences.updateCheck.visible.
Note that this will also disable notifications of new bugfix releases which you can upgrade to for free and which improve the stability or reliability of SmartGit.
If you just want to switch off automatic checking, use