Lots of ways to break the BOE installation, but one that is consistent is if you attempt to install the downloaded ZCM (10.0.3 in this case) from either a mapped drive or by copying the installation source up to the server first,

Even doing a manual installation as per the docs fails.

The only way to get a successful installation of ZCM with BOE appears to have the DVD or ISO actually mounted.

You can manually install as per the docs when the DVD is mounted even if you orginally installed off a local source as I did.

Poor coding in my opinion, but hopefully this post will help someone in the future.