Cannot find all items when installing from Eclipse
I don’t know for the zip package, but from what I have seen should be possible to install the System Workbench for STM32 from Eclipse. I don’t know if you follow the steps described in the documentation (OpenSTM32 Community Site » Documentation » System Workbench for STM32 » Installing System Workbench for STM32).
If you already try this way then ignore this post - if this is the case I can not answer why is not possible to install the addon System Workbench.
The address containing the installation site is here: http://www.ac6-tools.com/Eclipse-updates/org.openstm32.system-workbench.site
You can try to add this site to Eclipse updates (if you already didn’t try it) and check the instructions form here: http://www.openstm32.org/Installing+System+Workbench+for+STM32+from+Eclipse
I did’t try to install System Workbench this way.