Hello,

My friend has a problem with buying the game, he gets an error.

3D-Authentication failed. This vendor's rules require a successful 3D-Authentication.

Quote from Ikskast :

3D-Authentication failed. This vendor's rules require a successful 3D-Authentication.

This error indicates a failure in the processing of the card details entered by your friend. You can read this for some background information on the protocol. The most likely cause of a failure would be incorrect card details entered by your friend or something stopping the 3-D Secure verification step (e.g. a connection problem or something blocking JavaScript (e.g. NoScript)). Has your friend had any problems using the card to make other online purchases?

No, buying everything else is fine.

Still the same problem? He checked everything and it should all be fine? Help?

I would try and contact the devs direct (https://www.lfs.net/?page=mailus) pretty sure one of them will sort it for you

Is there any admin / mod here that could help my friend out with this? He has been trying to buy the game for the last two months.

Since you have S2, I assume you have working card or some other way to buy? Maybe you can buy him an S2 voucher-code? You recieve a code, give it to him and he enters it to unlock.

See https://www.lfs.net/?page=shop
If you want to buy LFS for someone else
Buy S2 voucher

No, I got it from a moderator / administrator for free as a bet