Trying to buy Battle Worlds Kronos, Sword of the Stars The Pit Gold and Pilgrim DLC and Dustforce, but the buy page won't let me check out, there's no place to enter my credit card number. Please help before the sale ends.

I fixed it. There was a glitch regarding the DLC for SotS, checkout thought I didn't have the required SotS Gold for the DLC so it wouldn't let me purchase, but after removing and then re-adding the Pilgrim DLC it worked. I guess because I already had them both at checkout it caused a glitch. Everyone watch out for that when you purchase the base game and DLC at the same time.

I think the traffic on the site is bringing them down again.
I tried to buy some games abiut an hour ago and Paypal went okay, but GOG just took me back to the checkout and sat there for ten minutes. So I decided to leave it as I already own physical copies of the games. Then I received 2 copies of invoicing from GOG, already having the one from Paypal, but the games only appeared in my account after I opened a new page to check and then having to refreshe the page.

Paypal only say I was invoiced the once, so I think GOG is struggling. They need to invest in more GOG bears to hold the site together.