How many computers can I install my plugin on?
Each license you buy lets you activate the plugin on 3 computers at a time. If you need to run it on a fourth machine, you'll first need to deactivate the plugin's license on one of your machines.
When deactivated, your plugin is still usable, but in a frozen state: your existing sessions will be able to load the plugin and its parameters in their last saved state. However you won't be able to tweak its parameters.