You can activate your serial on two computers, eg one desktop and one laptop. However your license is for a single editor, if you are commonly having two separate individuals using the plugins then we ask you please purchase two licenses. Volume discounts are available, please contact us for details.
You can deactivate to move licenses to a new computer as many times as you want. Please see this video for details. If you do not have the the CoreMelt License Tool shown in this video you can download it here: https://www.dropbox.com/s/kswvyyr2trd0m91/Tools.zip?dl=1