User blog comment:TheStudyOfTheUnknown/Is this a early version of the mod?/@comment-27172148-20151107135117

It looks like there are some links to each of the beta versions here, and that most links are working:

http://lotrminecraftmod.wikia.com/wiki/Updates#List_of_Updates

(including the 1.5.2 / Beta 6) that you have.

Sadly, the Beta 1 link isn't working...