The Express plugin disappeared from powerpoint

Express PowerPoint Plugin > Support Help
If the PresentationPro tab fails to show in PowerPoint it may be inactive or disabled.

To activate 
PowerPoint  2010 , PowerPoint 2013
1. . Click the File Button, click PowerPoint Options, and then click Add-Ins.  
2. In the Manage list, click Com Addins, and then click Go. 
3. In the Com Addins dialog box, check the box next to  PresentationPro PowerPoint Addin. 
4. Click the oxbutton 
5. Close PowerPoint and reopen 
6. The Search Icon should be visible in your tool bar under the PresentationPro tab.

To enable
PowerPoint  2010 , PowerPoint 2013
1. Click the File Button, click PowerPoint Options, and then click Add-Ins. 
2. In the Manage list, click Disabled Items, and then click Go. 
3. In the Disabled Items dialog box, click Highlight PresentationPro PowerPoint Addin. 
4. Click the Enable button 
5. Close PowerPoint and reopen 
6. The Search Icon should be visible in your tool bar under the PresentationPro tab.