Hi,
I have the exact same problem. Not sure if it will help much but I found that if I used my phones mobile internet, then I was able to access the renew page, even from the link in the Eset app. I was planning on upgrading from nod32 to internet security, but it wont allow me to pay for either the internet security or smart security premium with paypal, so I am going to stick with the basics until this problem is resolved.