The default location of the folder can be found here:
C:\Program Files\Microsoft System Center Virtual Machine Manager 2008 R2\Patch Import
You will most like need to use this if you are getting errors with P2V or V2V migrations and it’s complaining about drivers.
Here’s an example of people having issues an needing to place files in this location. The command you need to use is the Power Shell “Add-Patch” command.
Wanting to learn a bit more about HYPERV. Take a look at the HyperV and VMM categories on the right hand side.