[chrishajer]

The best way I know is with a linux system to use the patch command. If you don’t have access to that program, I could patch the file and email it for you. Or you could download a later release where the problem is already fixed. Check my profile for contact information if you need help.

There were other solutions as well in this post:

https://bbpress.org/forums/topic/installing-bbpress?replies=14#post-11787

Did you try anything else?