I had a WP 8 project which I wanted to convert to WP 8.1 so I can add a Windows 8.1 project to it to create a Universal App. But when I retargeted my project it was converted to WP Silverlight APP, so I can't find the "Add Windows 8.1 Project" option.
Any ideas how I retarget my project to be just WP 8.1 project?
You can only Retarget Silverlight 8.0
application to Silverlight 8.1
application.
You can't retarget Silverlight 8.0
to Runtime 8.1
application.
But you can migrate your application. Here's the document how you could achieve that ?
There is a free tool that helps alot with the conversion. Check out this page http://www.mobilize.net/silverlight
if this link fails try googling Mobilize.NET Corporation and the file installer is named MobilizeNetSilverlightBridge.msi