Here is the guide that explains how to download the code into MSPM0 based on Keil:

1. Right-click project files, then select open options for target
   Figure 3-46 Open Options for Target
2. Select a debugger from the Target Options window. To use XDS-110, select CMSIS-DAP Debugger. If J-Link is required, then select J-LINK/J-TRACE Cortex.
   Figure 3-47 Select the Debug Pane
3. Click on the Settings button. On the Debug tab, make sure the settings match with Figure 3-48 and Figure 3-49.
   Figure 3-48 Check the Setting of XDS110 Probe
   Figure 3-49 Check the Setting of J-Link Probe
4. Click on the Flash Download tab and check whether the description matches Figure 3-50. If this does not match, then click on the Add button and select the corresponding MSPM0 MAIN option. The device type is On-chip Flash. At last select Reset and Run.
   Figure 3-50 Flash Download Setting
5. Click the Build button to build the project, then click the Load button.
   Figure 3-51 Download Project
6. To build the FreeRTOS supported example, select Project → Batch Setup and select all the project targets for the build. Next, select Batch Build to build all the projects in the workspace.
   Figure 3-52 Build RTOS Example Under Keil