I mean, 20$ for two of the races or 25$ for all three, I'm going to buy them all at once, it's only another 5$ for me, but if it was a choice between 20$ or 30$, I'd only get the zerg and terran warchests.
Go into a different map instead of the one you wish to load and login into your Battle.net through the editor, leave that map open then proceed to open the map you have the mod plugged into, this should solve any issues you are having regarding that.
... AHH!! These UED snippets keep coming, foretelling of a great release, but this release, for all it's foretelling behind it, still to this day eludes us! When can we expect to see the mod slap us in the face and declare: "I'm here, rejoice!"