If you have a product-related question for an app that you’ve already have installed on your Mac (including trial versions), choose “Submit Support Enquiry” from the app’s “Help” menu. This will create a new mail message in your email application, prefilled with important information such as the version numbers of OS X and the app. For any other questions, send a message to .

I'm a one man show from Germany, timezone is Central European Time. Current local time is 12:14PM.

Please understand that I cannot provide phone support.

If an app fails to launch and if you get an error alert, saying that the app is damaged and needs to be reinstalled from the Mac App Store, then restart your Mac. Then launch the Mac App Store and sign in. If the problem still exists, move the app to the trash, then empty the trash. Launch the Mac App Store again, click on the "Purchased" icon in the window's title bar and reinstall the app from there.

Information about products not manufactured by me, Stefan Keller, or independent websites not controlled or tested by me, is provided without recommendation or endorsement. I assume no responsibility with regard to the selection, performance, or use of third-party websites or products. I make no representations regarding third-party website accuracy or reliability. Risks are inherent in the use of the Internet. Contact the vendor for additional information.