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