I had an installed DB 12c 12.1.0.2.0. (D:\app\xxx)
Today I installed Oracle Developer Tools for Visual Studio 2013 12.1.0.2.4 from Oracle Developer Tools for Visual Studio 2013 download page.
It was installed into: C:\Program Files (x86)\Oracle Developer Tools for VS2013
When I start VS 2013 I see dialog " ODP has been installed without a machine-wide configuration. A version of ODP.Net has been detected in GAC which may be incompatible. Please remove ODP.NET from GAC and restart VS".
My C:\Windows\Microsoft.NET\assembly\GAC_MSIL contains only one Oracle.ManagedDataAccess entry
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Oracle.ManagedDataAccess\v4.0_4.121.2.0__89b483f429c47342 and the version of the Oracle.ManagedDataAccess.dll is 4.121.2.0. I cannot delete this version since it is used by other applications.
What do I have to do to resolve this issue?