Merlin Project or Merlin Project Express: Damaged after the download

Occasionally we receive following question:
I've downloaded Merlin on my mac. When launching the application I get the error message saying that it is damaged. How to solve this?
Merlin Project 6.4.3 Is Released
Unfortunately, version 6.4.3 was not up to date for a long time, because an annoying crash in the application settings on the Mac crept in.
Please update to version 6.4.4!

We have just released the version 6.4.3 version 6.4.4. This free update is important for Merlin Project and Merlin Server.
- Update your Mac versions in Merlin Project for free with "Check for updates…".
- The version for the iPad and iPhone will be released after review in the App Store automatically.
We have also updated Merlin Project Express. The new versions will be provided in the Mac App Store or at SetApp – right after its review.
Merlin Project 6.4 Is Released

We have just released the version 6.4. This free update is important for Merlin Project and Merlin Server.
- Update your Mac versions in Merlin Project for free with "Check for updates…".
- The version for the iPad and iPhone will be released after review in the App Store automatically.
We have also updated Merlin Project Express. The new versions will be provided in the Mac App Store or at SetApp – right after its review.
Merlin Project 6.3.1 Is Released

We have just released the version 6.3.1. This free update is important for Merlin Project and Merlin Server.
- Update your Mac versions in Merlin Project for free with "Check for updates…".
- The version for the iPad and iPhone will be released after review in the App Store automatically.
We have also updated Merlin Project Express. The new versions will be provided in the Mac App Store or at SetApp – right after its review.
Merlin Project 6.3 Is Released

We have just released the version 6.3. This free update is important for Merlin Project and Merlin Server.
- Update your Mac versions in Merlin Project for free with "Check for updates…".
- The version for the iPad and iPhone will be released after review in the App Store automatically.
We have also updated Merlin Project Express. The new versions will be provided in the Mac App Store or at SetApp – right after its review.