Hello. As you were the only one that could be bothered to reply to my question on the same subject, here's what I got from line 6 when I opened a support ticket (I didn't see the storesupport email address at the time) :-
"The Paypal option is available in Europe. Maybe you did it from store.line6.com, which is US-only. You need to change your l6.com website locale to international, then go to the web store link. You should then be on shop.line6.com, and it should then work. Please contact storesupport@line6.com if you experience any webshop issues again."
I haven't tried this as I'm going to wait for the next discount offer.
regards