Theres no need for dongles. Dongles are redundant. LimeLM takes an accurate fuzzy fingerprint of the device and uses that.
So, you have a few options, but here are the two most common for customers that need to move a license between computers:
1. Use deactivation: https://wyday.com/limelm/help/activations/
2. Use TurboFloat: https://wyday.com/limelm/help/using-turbofloat/
Both of these are covered in our licensing types article: https://wyday.com/limelm/help/licensing-types/
Let me know if you have any other questions.