You can enable and disable event providers at any time.
Enabling a provider will load the provider up in memory. Disabling a provider will unload it from memory. You can only enable as many instances of event providers that are allowed in your license. Standard edition only allows 1 instance. Professional edition allows up to the total instances defined in your license. You must disable one provider before you can enable another if you are at your instance limit.
The provider will become active or disabled after the Events2HVAC service or command queue is restarted.