Interrupting an install like this is fraught with danger.
When you describe what you did I start thinking one should reinstall anyway, and it is unlikely you can do it via the mac app store directly now, even with the utility installed because it probably won't pick up that there are bits missing. (Remember that there are 3 components to this update, not just 1. There is the 10.12.1 update which will increase the build number - but also a firmware update and a full bundle update).
There are 4 options now.
1. Restore from the backup you made before attempting the update. (And PLEASE say you did this. I don't want to hear that you didn't). Here we are assuming this would be build 16A323. If not then update to that build first. Install the utility. Then update again to 10.12.1 build 16B2327e.
2. Clean install build 16A323, install the utility and update to 10.12.1 build 16B2327e.
3. Download the packages from apple's developer forums and install using the second method specified there, namely by running the packages individually from another partition carefully selecting the Sierra partition onto which they are to be installed. This will ensure that all the components (including some you may have missed by the interruption actually get installed)
4. If your system is still workable you may prefer to wait for the second 10.12.1 beta, install this without interruption this time.