From DBWiki
If you are on the website and you have picked a seller on the list sellers page, click on that seller's BUY button to download a Bitmunk Contract (BMC) file. The Bitmunk Contract file contains all the information the Bitmunk Client needs to buy a certain set of files.
Once you click on the BUY button, your web browser will attempt to automatically load the contract file into the Bitmunk Client. If it does not, you should save the contract file and start the Bitmunk Client manually.
Once the Bitmunk Client has started and you have logged in, you may load the Contract file by selecting File >> Open Contract.... This will open a dialog box where you may choose the contract file you saved to your hard drive.
