Desktop App stuck on "Preparing to download"

OS X 10.10.1 on a late 2009 iMac

I purchased the Tanakh and Rabbinic Judaism Research Library and downloaded the mac software on the receipt screen, but after installing I can't seem to get past:

I'm unsure as to what is downloading at this step and any help would be appreciated! (Are logs even possible at this point?)

Thanks!

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Ok, I did not properly heed "This may take a while..."

...Now I'm on to the monster download step!

Thanks again.

I was about to complain about a 2 hour preparing library before it finally began indexing. I am a bit suspicious.