1, dongle and authorization file are required to run EPLAN. 2. Use the virtual encryption dog to fool Epland. Only one authorization document can be found on Baidu, and I didn't find the second one. 3. To use the virtual dongle, you need to turn off the mandatory digital signature of windows system. In the process of use, a new project can only be created after the software reports a "hardware problem", and other things will not affect the use.