Based on the available download, I must say that ILWIS Academic is provided as an Academic product, which means that you won't be able to register it for companies, although the registration form allows you to enter whatever you want as data.
You can download the product from the following link and contact them using these details:
UNIVERSITY OF TWENTE
DRIENERLOLAAN 5
7522 NB ENSCHEDE
0031 53 489 9111
[email protected]