Upgrade Legacy Group Forums in Buddypress to bbPress

Based on http://codex.buddypress.org/user/buddypress-site-administration/migrating-from-old-forums-to-bbpress-2/

1) Make sure you are using latest WP and Buddypress. BACKUP mysql database and site.
2) Disable all plugins but Buddypress
3) Revert to default Buddypress theme.
4) Install bbPress and activate it.
5) Remove “Forums” page from BuddyPress
In the WP admin dashboard, navigate to “Settings > BuddyPress“.  Click on the “Pages” tab.
Under “Discussion Forums“, select “None” and save.
5) Disable BuddyPress’ Forums Component
In the WP admin dashboard, navigate to “Settings > BuddyPress“.  Click on the “Components” tab.
Uncheck “Group Forums (Legacy)” and save settings.
6) Import old forums to bbPress 2
In the WP admin dashboard, navigate to “Tools > Forums“
Click on the “Import Forums” tab.
Under “Select Platform”, make sure “bbPress1” is selected.
For “Database Name”, “Database User”, “Database Password”, use the values as set in wp-config.php.
Under “Table Prefix”, type in your bbPress prefix. For most users, this will be "wp_bb_"  as set in bb-config.php
Click on the “Start” button.
7) Repair bbPress 2 forum relationships
In the WP admin dashboard, navigate to “Tools > Forums“
Check the first option and hit “Repair“.
Next, check the second option and hit “Repair“.  Keep doing this until you have completed each option on this page.
8) Configure bbPress settings for BuddyPress
In the WP admin dashboard, navigate to “Settings > Forums“
Make sure “Enable Group Forums” is checked (Allow BuddyPress Groups to have their own forums)
Under “Group Forums Parent“, ensure “Group Forums” is selected.
Save Changes.
9) Make “Forums” page a sitewide index (optional)
In the WP admin dashboard, navigate to “Pages“
Find your old BuddyPress forums page (usually named “Forums”) and edit that page.
In the post content, type in:
[bbp-forum-index]
This will use bbPress’ forum index shortcode to populate the sitewide forum index on our forums page.