The License File Parser allows you to easily convert the contents of your Autodesk license file into an easy to read report. Among other pieces of useful information, the report contains the full name of the licensed product, the serial numbers, and the number of seats.

You can upload a *.lic or *.dat file
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Your stand-alone Autodesk product licenses have become corrupted and you want to know how they can be reset.


Use the following steps to reset the stand-alone licenses for all Autodesk products (version 2010 or higher):
1. Make sure there is no Autodesk product currently running.  If there is, close the application.
2. Rename the file to  This file can be found at the following locations:

Windows XP
C:Documents and SettingsAll UsersApplication DataFLEXnet

Vista/Windows 7C:ProgramDataFLEXnet

3. Restart your Autodesk product and go through the activation procedure again.
Note: This file contains all product activations for all 2010 and higher Autodesk products installed on your system.  You will need to re-register these products if this file is renamed/deleted.

Autodesk – AutoCAD Services & Support – How to reset your stand-alone Autodesk product licenses

  1. Typos are made during activation
  2. The serial number you are attempting to use does not match the product
  3. The serial number you are attempting to use is truly not valid anymore
  4. The contact information you are using does not match what is already associated with the Serial Number when the product was registered

From Autodesk – Autodesk Revit Architecture Services & Support – Top Four Reasons Why You May Receive a Serial Number Error During Activation

I had to format and re-install Vista on a laptop over the holiday break. Given that it was an OEM version, and the original disks were not available, I was faced with a bit of a conundrum. How will I restore the activation data without having to contact Microsoft?

Perhaps you have faced a similar problem. Often, OEM installation media is packed with software you don’t need, and it only serves to slow down your PC right from the get-go. However, you can install Vista using standard installation media, and then ‘backup and restore’ the Vista activation data. This way, you are starting with a truly ‘clean’ system. Of course, you will then need to download and install all the necessary drivers for your system.

Before starting the process, I backed up the activation data using the software at the link below. After obtaining some installation media, I installed Vista without providing any product keys (you should be able to do this with any retail Vista media). Then, I restored the activation data. It worked perfectly.

You can download the activation backup and restore utility at

You can find a pretty good guide to re-installing a clean system at