Quote: "And the license says that you do not have the right to redistribuete the link"
When you read that, something in your head should say, 'hmm...that sounds
really really stupid, I better reread that"
The license says you cannot distribute the model without the permission of the author, and without providing a link back to the source (that page).
Quote: "If im ready ill convert them under the condition you ask for permission."
He shouldn't need to ask for permission to have the model converted. The license is just to prevent people from taking credit for it / making money, etc. from it. He's not distributing the model - he provided the source link, and you wouldn't be distributing it back - he already has the model and knows the source. But IANAL, so I could be mistaken.
(Though it looks like he would need permission to use it in a game, unless a game is considered a 'video or picture rendering' production.)