Unavailable to change product type to “subscription”

Hi,
I have installed your plugin, but in WooCommerce >?Product detail I havent choice as you shows in video – “Simple subscription”. What Iam doing wrong? Is there any other choice howto add this choice to product? I have lastest version of WooCommerce, tried to disable all other plugins (to prevent conflict), but still can see only these choices: “Simple product, Grouped product, External product, Product with variations”.
Thank you for reply – your plugin seems awesome, I would like to use it.