There are multiple options to check which version of Jasperactive you are using:
In the red ribbon at the top of the screen in your Jasperactive account hover your cursor over the Jasperactive Installer icon (the 'J' icon) and there will be a window that appears displaying which version of Jasperactive you are currently using.
Alternatively, click the Jasperactive Installer icon (the 'J' icon) and the version will appear on this page.
Once you log into Jasperactive and start an exercise in a lesson, you will see the version number of Jasperactive in the "Loading, please wait..." dialogue box (first image below) as well as in the bottom middle of the exercise window (Jasperactive Instruction pane window - second image below).
This same information displays in other similar areas too, such as when this Jasperactive Instruction pane is exited (X icon in the top right corner the exit dialogue box appears) or the lesson exercise is submitted (Submit button dialogue box appears).