Marketplace modules cannot be added in Studio Pro 10.5.0?

The version 10.5.0 seems to have a devastating problem with marketplace modules. If downloaded within Studio Pro, the usual "success" message does not pop up and the modules don't appear in the list of Marketplace modules in App Explorer and the whole environment gets broken. Tested with a fresh app to add Mx Module Reflection, Excel Importer and Community Commons. Installation of none of them finished successfuly.
1 answers

I have no problem adding Marketplace modules in Mx 10.5 and still get messages like "The module was successfully imported into your project. It is available in the App Explorer under App 'App_temp' > Marketplace modules.".


What does the latest log file show in the log directory? (From Studio pro: Help - Open Log File Directory)