Why does the Zenler Studio toolbar not show up in PowerPoint?

Zenler Studio > Support Help
If your Zenler Studio toolbar is not visible (gone or missing), then the Zenler Studio add-in may be disabled. Please do the following steps to enable the disabledZenler Studio add-in in PowerPoint. PowerPoint 2007/2010

1. Open“PowerPoint Options” dialog.

   (For PowerPoint 2007)
     a. Click the Office button shown at the upper left corner.
     b. Click on the “PowerPoint Options” button

      OR

   (For PowerPoint 2010)
     a. Click the File tab shown at the upper left corner.
     b. Click "Options".

2. Select the Add-Ins tab from the left navigation panel
3. From the Manage drop-down list shown at the bottom of the screen, choose “Disabled Items” and click the “Go”
    button.
4. On the Disabled Items window, select each of the items listed and click the “Enable” button. 
5. Go to the “Manage” drop-down list, select the “COM Add-ins” and click the “Go” button.
6. Check whether the item “Zenler Studio” is checked on or not. If it is unchecked, check on the same.
7. Click the “OK” button.
8. Restart PowerPoint.