Just because the plugin used to work doesn't mean that something in OpenMPT broke; The plugin may simply not work under Windows 10, for example, even when using an older OpenMPT version. That being said, I installed the plugin on my Windows 10 machine and it works fine. It's most likely not OpenMPT's fault that the plugin isn't working properly for you, but if you provide the crash dump file created by OpenMPT I can verify that.

I don't think I can do that as OpenMPT isn't generating any crash dump files. It just freezes when I load the plugin menu. Going into task manager and stopping the "OpenMPT plugin bridge 32bit" process seems to stop the freezing at the cost of not being able to use the plugin.

Will investigate further.

Can you right-click the frozen plugin bridge process and choose "Create dump file"? The generated file will be quite big but compresses well with 7z or WinRAR.

Will this do? I had a hard time trying to compress the file small enough to the sites maximum file size threshold. The initial file size was around 180 megabytes and standard compression was only able to get the file size down to around 41 to 45 megabytes. I split this up into 5-megabyte volumes which reduced the zip file to only 3.9 megabytes, however, it stored some of the files on my computer, so I am not sure if this is complete.

That's missing some parts of the ZIP file, but as said - 7Z or RAR are much better alternatives (they will reduce the size much more than ZIP does). It would be easiest to upload it to any cloud storage like Dropbox/SkyDrive/etc. if that's available to you.

https://drive.google.com/file/d/1jldBAN1RqaopujmIHNZszRgJ1nVVBy0e/view?usp=sharing

Let me know if you have trouble downloading the file

Unfortunately the memory dump doesn't show anything problematic - the plugin appears to be drawing its UI so it wasn't even frozen.

That being said - the plugin hasn't been updated in over 10 years, and there isn't even a 64-bit version. I wouldn't start using such a plugin because it shows that if more problems arise in the future, there's no chance that they will be fixed in the plugin. I'd try to find an alternative that has recent updates and offers a 64-bit version. The icing on the top of the cake would be if the plugin is open-source of course, because that will help keeping it runnig in the future even if the original author is no longer interested in maintaining it.