When trying to run FTK Imager 3.1.1 Lite, you are seeing at least one the following errors:
This app has been blocked for your protection.
An administrator has blocked you from running this app. For more information, contact the administrator.
This seems to be an issue with only the older versions, 3.x, of Imager. To resolve this issue use the below steps to create Imager Lite using the most recent release of FTK Imager.
1. Download FTK Imager 4.3. - https://accessdata.com/product-download/ftk-imager-version-4-3-0
2. Use this guide to turn v4.3 into Imager lite - Run FTK Imager from a flash drive (Imager Lite)