This is normally the result of a mis-understanding of how our license system works.

If you have two computers, you cannot use a license file requested on one computer on the other (e.g. users with a desktop and a laptop computer need two licenses).

If you have two copies of InDesign installed, you cannot use a license file requested from one copy of InDesign with the other (e.g. users of CS4 and CS5 need two licenses).

If you have two operating systems installed on your computer, you cannot use a license file requested from one operating system on the other (e.g. Macs with Bootcamp, or computers with VMware or Parallels need two licenses).

Finally, sometimes people simply buy the wrong license - e.g. they want TextExporter, but instead bought the optional APID ToolAssistant license. Please read the product page for the tool you're trying to install carefully. For many of our tools a APID ToolAssistant license is optional, and unless you also buy a license for the tool itself, a license for APID ToolAssistant all by itself won't do you much good. Licensing APID ToolAssistant unlocks optional functionality in tools like ImageLibraryLoader and LayerLifter.

Please read the following carefully:

http://www.rorohiko.com/licensing