The same has happened to me. I have read something about a Test version? I want to use the Installer from the release thread but I am not sure that is going to fix anything, and I can not test it anyways, as I am currently at work, haha. Anyways, I get this error after using the exe to auto update. Not sure if that narrows it down.
if your in us, and have the latest patch installed then you can download this version here . http://www.thebuddyforum.com/releases/124816-honorbuddy-v2-5-7280-629-patch-5-3-0-17116-a.html if your in EU and have NOT patched yet, you can download the older build here. http://updates.buddyauth.com/GetSpecific?filter=Honorbuddy&build=628 if it asks you to autoupdate just click no.