If you already have an installation of Dimensions CM that you plan to use as the Serena Dimensions CM, you do not need to install a new system for Serena Development Manager.
This version of Serena Development Manager requires Dimensions CM 12.2 in order for Dimensions CM to provide the correct process model. It is possible to upgrade a Dimensions CM 12.1 installation to 12.2, but you will need to carry out some changes to the process model. Please contact Serena Support for details.
You do need to do the following:
Ensure that you are running a supported version of Dimensions CM as indicated in the Serena Development Manager Readme.
If you want to use Single Sign On (SSO) you will need to make sure it is enabled for Dimensions CM. For configuring SSO if not already enabled, see Dimensions CM Support for SSO in the Dimensions CM Administrator’s Guide.
After installing the rest of the products in the suite, follow the post-installation configuration instructions for Dimensions CM.