edit 2023-01-02: The 32-bit client has been disabled. It will launch but will crash out within about a second after launching, most likely due to being rejected by the authentication server.
edit 2023-01-17: I have read several reports from people who claim they are still able to play using the 32-bit client. I am unable to do so (I checked just before writing this addendum to this post).
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Unless there's some other announcement to the contrary, the last word from SSG is that the 32-bit client will cease to function on 01 Jan 2023. If you're still using SSG's "Mac Download" version of the game (i.e. the Windows version of the game packaged with a very old version of WINE) you cannot run the 64-bit client. You need to either be running MacOS 10.14 Mojave with WINE 7.0 or higher, or any version of MacOS from 10.13 High Sierra to 13 Ventura with Crossover; in order to run the 64-bit client on a Mac running MacOS. (Other alternatives include Boot Camp/Windows but that turns your Mac into a PC, perfectly fine but be aware that it involves rebooting to run Windows; and various emulators such as Parallels, which do not run LOTRO as well as open-source WINE or Crossover.)
If you are running Mojave, here are the instructions for getting a modern version of WINE so you can run the 64-bit client:
https://forums.lotro.com/forums/show...pler-procedure
This uses open-source WINE, which is free. You must be running Mojave, no earlier or later version of MacOS will work.
If you are running any version of MacOS other than Mojave, or if you want an easier and better experience, you should choose Crossover. Crossover is essentially the "pro" version of WINE:
https://www.codeweavers.com/crossover
Crossover is Codeweavers' proprietary version of WINE with an easy to use GUI on top. It is a commercial product, so not free, but there is a 2-week free trial so you can be sure it works for you before committing to a purchase.