Here's how many

• If the License Key was purchased by an individual, you may install Lumion on as many computers as you want, provided that all of the computers belong to you.
• If the License Key was purchased by a company, you may install Lumion on any computer that belongs to the company. However, if the company has multiple branches that operate as separate legal entities, those branches must purchase their own Lumion License Keys.
• The number of Seats for the License Key determines how many PCs you can use Lumion on at the same time.

See also:

• Knowledge Base: How does the license system work?
• Knowledge Base: How do you buy additional Seats?