Hello,
In order to use the MBD for BMS v1.2.0, you need to install beforehand the MBDT for S32K3 version 1.4.0. It is a must to use the 1.4.0 version.
The setup should be:
0. Uninstall all MBD for S32K3 toolboxes you have already installed as you can't have two MBD for S32K3 installed in the same MATLAB version.
1. Install MBD for S32K3 1.4.0
2. Install MBD for BMS 1.2.0
3. Open MBD for BMS toolbox, navigate in MATLAB to the patches folder and extract the achieve saved there.

4. Open the newly created folder and run the .m script.

5. Run mbd_s32k3_path script from the MBD for S32K3 toolbox
6. Run mbd_bms_path script from the MBD for BMS toolbox
7. The toolboxes are now properly installed. You can open an example and generate code and deploy it on target.
Let me know if these instructions help you!
Best regards,
Sorin Bancila