"I deleted the old version, did a new download, dragged the app-file to the application folder but unfortunately got this error message:

Process:         qgroundcontrol [22218]
Path:          …"

"The Mac version gives this error message:

Process: qgroundcontrol [21948]
Path: /Applications/qgroundcontrol.app/Contents/MacOS/qgroundcontrol
Identifier: com.yourcompany.qgroundcontrol
Version: ??? (???)
Code Type: X86 (Native)
Parent Process:…"

"Excellent job!
Is there also an address in Europe for buying APM mainboard, IMU shield, pins, connectors, etc?"