Moving an Individual or Node-Locked license of ExtendSim from one device to another works the same as for most applications.
For complete installation instructions, see Frequently Asked Questions • Individual & Node-Locked Licenses.
Note: If you're running ExtendSim on a Client device of an ExtendSim Floating license, the procedure is different. After, making copies of your ExtendSim models, any custom blocks, etc., please follow these instructions to Uninstall ExtendSim from a Client device.