STM32MP1 support available in SW4STM32

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world.
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4; you can download a short video showcasing this on the ac6-tools website (registration required).

System Workbench for STM32

Error during first run after install

Not sure about the first one.
On the second one (from another post):
If the .cproject file are associated with System Workbench, just double-click on this file to open System Workbench and import the generated project into the workspace.
If not:
try to add the association. Open the preferences window, click on Window menu then Preferences. In the Preferences view, select System Workbench in the tree and click on File Association, and Install button: