Are you trying to use a free option, or are you trying to pay for this infection?

There are extra steps with the free one - at the bottom of the page, after you select your strain, you need to select what stage you want it at! Once you have that selected, there's a confirmation that you'll need to click on and you will get the free strain.

You're welcome! Please post if you're still having issues after following the steps that I gave you, so I can work with the programmers to make sure that this is working properly.

Thank you for letting me know that it worked!