Recently I tried to upgrade a TFS 2015 installation for a client to Update 1. Because I did not find a solution in the internet (even with the error code TF401147), it’s time to blog about a solution. Installation of Update 1 - VS402388 / TF401147 The installation of update 1 worked perfectly: In the first place I installed it because we wanted to move TFS to a more performant server and I installed the new server with TFS 2015 Update 1.