You can pre-order and pay via Paypal

To do this you need to do the following: -
Click the TGN logo at the bottom left of this website.
This opens the TGN website.
Find Galciv II Dark Avatar.
Click 'Pre-order'
Click 'checkout'
Log in with your Stardock Store id if you have one (this is not your id for here). If you don't have an ID just fill in the relevant fields.
Click continue.
This takes you to the 'Verify your order' page. In the middle of this page is a section that says.. "If you have a PayPal account and would like to process your payment through PayPal click on the PayPal button or click here." Click this!
This will open up the paypal page where you can enter the relevant details for your paypal account.
Hope that helps

NB For TGN subscription holders & people with TGN tokens, you can pre-order DA using the method above but instead of clicking 'Unit Price' you click the token link.