We want to use this on a multi-site installation. But, I can't find anywhere in your information that states if it's compatible or not. We may be interested in other plugins as well and need to know, in general, if all your plugins are multi-site capable.

Hi Joe! Thank you for posting your question!

Our plugins, including Facebook Feed WD are compatible with multisite WordPress. However, please make sure to test with free version first, and let our team know in case there will be any glitches.

You can download Facebook Feed WD lite from the following link:
wordpress.org/plugins/wd-facebook-feed/

Thanks! Have a great day!

OK, thank you. We went ahead and purchased the Pro version and installed it.

Now there's a second issue, at the completion of the purchase I had two links. One to download it which worked fine and the other for the User Manual that produced a 404 error. Where can I obtain and download the User Manual?

Hello Gary!

Thanks for reporting this. I have notified our developers, they will check the link to user guide out soon.
Meanwhile, let me provide you its link, so you can work on your Facebook Feed WD: goo.gl/nv3bV1

Feel free to let me know in case you have questions.
Thank you! Have a great day!