If you are using a USB dongle (the most common security key), follow these steps provided by the official JewelCAD documentation :
: Intel Core 2 Duo or higher recommended for stability. how to install jewelcad 51 in windows 10 top
: Windows 10 (32-bit or 64-bit supported with Update 13). If you are using a USB dongle (the
: Do not have the security key plugged in when you start the setup. how to install jewelcad 51 in windows 10 top