Archive Distribution Fails to Run on macOS 10.12 (Sierra)

Problem

For versions prior to 18.1, the classic archive distributions of Oxygen XML Developer (.zip or .tar.gz) fail to run on macOS 10.12 (Sierra).

Cause

This happens because the archives get quarantined and macOS 10.12 (Sierra) treats quarantined apps differently than older versions and isolates them from their parent folder at launch. If Oxygen XML Developer was already installed when you upgraded to macOS 10.12 (Sierra), there are no problems.

Solution

If Oxygen XML Developer was not already installed, or you need to reinstall an older version (prior to version 18.1), the quarantine flag must be removed for the entire content of the Oxygen XML Developer installation directory or the individual applications. To resolve this issue, follow these steps:

Open a Terminal window and change the directory to the folder where Oxygen XML Developer is located.
Run the following command:
```
xattr -dr com.apple.quarantine oxygen/
```
where "oxygen" is the actual name of the Oxygen XML Developer directory.

If Oxygen XML Developer is in a location that requires administrator privileges for write access, you need to run the command from an administrator account and prefix the command with sudo. You will then be prompted to enter your password.