To check what version is currently installed on your computer go to the "Help" menu and click "About". You will see an image with the version number in the middle.
A notification dialog will pop up indicating when a new version of SVOFFICE 5 is available for download. If this notification has been disabled, the "Check for Updates" menu item found in the Help menu will also be colored to indicate that an update is available.
To see if a new version is available look on the lower bottom left corner of your project manager screen for the following image:
Then, click on "New SVOffice Available" and you will be taken to the downloads page.