Hi! I was wondering whether I could upgrade to S3 for 12£ from S2 after I have bought S2? Or do I still have to pay the full price?

Hi, yes, you can upgrade at any later time and you only pay the difference, not the full price again.

Got it finally
Is it safe to use tweaks or something similar in "fun" servers or is it illegal? Just wondering.

Tweaks are ok on designated servers. You can recognise them by the 'modified' tag in the list of hosts in LFS.

Quote :

The Card Type selected does not match card number.

Trying with visa electron...

Have you tried selecting the card type Visa Debit, on the payment pages?

Quote from Victor :

Have you tried selecting the card type Visa Debit, on the payment pages?

I tried now, thank you, work that way