I was recently onsite trying to install Workflow Manager 1.0 and configure a workflow farm for a Project Server 2013 SP1 installation. I had Windows 2012 R2 on all Project Server and SQL Servers.
Firstly to get the Workflow Manager 1.0 Binaries to install on Win 2012 R2, I downloaded the EN CU2 update for Workflow Manager;
This allowed the files to install.
However, when I run the farm config, it fails at the ‘Add host to workflow manager farm’ point. I get the following error;
The remote server returned an error: (400) Bad Request. The api-version in the query string is not supported. Either remove it from the Uri or use one of ‘2012-03’..
So after some looking around, I realised I also needed the update as the first one doesn’t update the whole workflow manger installation;
Also for good measure, I installed the Workflow Manager 1.0 Client CU2 from the first link mentioned.
After this, everything worked.