I purchased AutoCAD LT 2013 from Amazon & want to know how many computers can this software be installed on? I think it was only a stand alone license. If it can only be installed and used on one computer at a time how much would another license cost? Would I have to buy another installation disk for the same price or can I buy just the license for a lower rate?
Standalone licenses can be installed on two computers provided that you only use the software on one computer at any time.
Regarding purchasing another seat, you would need to pay full price for a new license.
Camilo is right. You are allowed two activations. For example, one on your workstation and one on your laptop for use away from the office (provided only one is used at a time.) If you plan on having another user also use AutoCAD, you will need one licensed seat for each user that you plan on accessing AutoCAD concurrently. This information can be found in the EULA.
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