Some customers experience issues with the installation of the BI xPress AddIn to Visual Studio 2012, and there are a few areas to check to ensure a successful installation.
1. Tools >>> Options >>> Add In Security --- Please make sure that the following folder path is included in your list here.
2. Tools >>> Add-In Manager --- You should see this as an available Add-in.
3. Verify everything you have installed for VS 2012 from the Help >>> About Microsoft