I'm afraid, you can't. You must have TikVideoPoster standard first to be able to buy TikVideoPoster Agency. Even if you buy TikVideoPoster Agency without buying the TikVideoPoster standard you wouldn't be able to use the software. 

Here is why:

1. TikVideoPoster Agency is an upgrade/up-sell of TikVideoPoster standard.

2. TikVideoPoster Agency gives you 10 license keys to activate your TikVideoPoster on 10 additional computer.

3. TikVideoPoster Agency is dependent on TikVideoPoster Standard.

4. TikVideoPoster Agency doesn't have an independent login to give you access to TikVideoPoster software.