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1. Shutdown the guest OS (the virtual machine)

2. Login to the local instance of VMWare ESXi

3. Go to the page for the virtual machine and click 'Edit'

4. In the dialog that appears go to the VM Options tab, then expand the Advanced tree node and in the Configuration Parameters section, click the Edit Configuration ... button.

5. In the dialog that appears, click Add and add a parameter named disk.EnableUUID with a value of TRUE.

6. Save the changes.

7. Start the guest OS/virtual machine.

8. Check if the hard drive serial number is now available in the guest OS

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If this solution does not work:

Please do the following:

1. Close out of Imatest

2. Update the [imatest] section of your INI file to include the entry license_debug = 1.

   1. If needed, here are instructions to help with this: How To: Find Your Default INI File.

3. Delete the .lic file from:

   1. Mac: /Library/Application Support/Imatest

   2. Windows: C:\ProgramData\Imatest\license

   3. Linux: /var/lib/imatest 

4. Restart your computer

5. Re-try the activation

If this does not fix things, please send us any log files located at C:\ProgramData\Imatest\license and C:\Users\<user>\AppData\Roaming\Imatest, as well as the error message you are seeing, and we will look into it further.

**NOTE: ProgramData and AppData are hidden folders. Instructions on how to view hidden files on Windows can be found here: https://support.microsoft.com/en-us/windows/view-hidden-files-and-folders-in-windows-97fbc472-c603-9d90-91d0-1166d1d9f4b5.