I only have 18 employees that need access to the model viewer, do I have to get a small license at 25 seats?

Yes, we are not offering enterprise licenses between the tiers outlined below:

• Small Enterprise License: 10, 25, or 50 users
• Medium Enterprise License: 100, 150, 200 or 250 users
• Unlimited Enterprise License: Unlimited number of users* (enterprise-wide hosted PDF is included)
  * Anyone who has an email address with the Unlimited Enterprise License holder’s domain name can email [e-mail] to gain access to the model and materials.

For more information about Enterprise Licensing, please click here.