It has come to our attention that some users on newer Macintosh models may be encountering an issue when installing or patching DDO that does not allow that process to complete properly. The symptom of this would be your launcher appearing to attempt to patch before stopping with an error stating "Internal Error". Underneath that error window if there is text that states "Netsession Error" this is the issue being addressed in this thread.
If they is happening to you, it may be resolved by installing Netsession directly from the link below.
https://client.akamai.com/conf/insta...file=installer
If this does not resolve your patching issues, let us know and we will continue investigating.