I'm afraid you can't. Here is why:
1. Funnelify PRO is an upgrade of Funnelify Ten and/or Funnelify Unlimited which adds the PRO Features in your Funnelify Account.
2. Since Funnelify PRO is only up-sells or upgrade you must have Funnelify Ten or Funnelify Unlimited in your account first in order to buy the Funnelify PRO.
3. Even if you buy Funnelify PRO without buying Funnelify Ten or Funnelify Unlimited you wouldn't be able to use Funnelify because Funnelify PRO is depended on the standard product. So, with only Funnelify PRO in your account you wouldn't be able to login.
Note: In case you bought Funnelify PRO without buying Funnelify Ten or Funnelify Unlimited consider buying the standard/main product from our sales page here: http://funnelify.com/fe/