To use Revolution slider options you don’t need activation. Please, read the bundled plugins policy https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins
You need to buy a personal license only if you want to use Revolutions slider Addons because they come as separate plugins that did not include in the Revolution slider plugin.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.