Enterprise is already available from 10 users up, so that may be a small extra investment for your company, but saves you at least a lot of installation and systems admin time.
AND Enterprise gives you a lot of extra's like integration with Sharepoint, and over 550 Webapps etc.
Through a bit of work I have found the following. If you run the vendor provided install (talking about the non enterprise install) on a reference machine (clean Windows OS install and little else) and look %Temp% with %Temp% sorted by date you will see ne folders appear.
With a little playing I managed to copy all the folders out which reveals a MSI for mind manager as well as the sharepoint components. I could not find the C++ redistributable install files or the MSXML install files but those are easy enough to download via Microsoft.
Once I had all those MSI's I was able to put together a silent install we deployed via SCCM. Normally we do not like pulling apart vendor installers like this but given the choice between hand installing the product on each machine or pulling apart the vendor install to create a more manageable process we will pull the install apart.
Luckily the license key entry does not require elevated rights.
Hope this helps others.