“<filename>.pptx couldn’t be converted to presentation because Visual Basic for Application (VBA) is not installed on this computer. Please install VBA and try again”
1. Open Add or Remove Programs in Control Panel, select Microsoft Office (Professional Plus) 2013 client and click Change
2. Select Add or Remove Features and click on Continue
3. Expand Office Shared Features and check if Visual Basic for Application has been installed.
4. Click on Continue
5. Restart Skype for Business and re-try to present the PowerPoint file.