Id imagine we could use the updater.exe to get the new update, or just do a fresh install like old times.
Also it will probably update once you open HB. If you open the 5198, you will see
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You have not selected a valid instance of WoW to attach to!
Please restart Honorbuddy and choose a valid instance of WoW to use Honorbuddy with!
This version of Honorbuddy only supports WoW Build #14480
You are currently on build #0
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Honorbuddy is up-to-date
So it tried to check if there was an update after it saw that the client didnt match up.