There are not many French speaking contributors on these forums, so they operate in English. However I think you are asking about whether RH8 is still supported. Adobe now has RH11 which is four versions after RH8. Your version of RH will still work, although you should test all aspects of your usage and output thoroughly to be sure. I have to admit I don't know what "extended support" is. Maybe something has got lost inn translation here. Maybe you are talking about the maintenance plans which allow you to upgrade. However if you are still using RH8 I doubt whether this is the case.