I don't yet have much information, but basically, with Yesterday's patch - 11.2 - (Wednesday 24 July).
There were significant changes to the Launcher.
However, there is nothing "noteworthy" in the Release notes.
The Mac Client (which has been the test bed for this new launcher) has worked fine for me so far since the patch.
However, trying to run via Crossover and PyLotRO is "interesting." I have just begun to investigate, so this is only a partial report.
PyLotRO "patches" as one would expect ... up to a point.
It ends with the following dialog:
=<cut here>=
Self patch required. Program will restart.
Connecting to patch.lotro.com:80
Checking files...
files to patch: 1 bytes to download: 0
Patching files:
Downloading patchclient.dllFile in use. It will be self patched.
Self patch required. Program will restart.
Finished
=<cut here>=
The above is "normal" and routine. What happens next is not.
At this point PyLotro (itself still running) launches the "LOTRO Patcher" to do the rest of the patching...
which promptly fails after downloading the 30 transition screens....
SIgh... more work to be done.