Can't download games

Hi I have only just got an R$ card for my son's ds and have followed instructions on how to download the games... However when i am trying to download Sims Kingdom and Walle it is sayin something like cannot access data please re-insert r4 card.............Does anyone know if i have done something wrong or if there is something wrong with the r4 card...Be grateful if you could help me with how to solve this.
Thanks

Sticky thread with the solution: https://www.romulation.org/forum/index.php/topic,1462.0.html

H ihas anyone got really simple instruction on how to download the latest firmware.. so it enables me to download sims kingdom and others
Thanks

I'm getting confused now, by download do you mean play it on your R4 as with the "cannot access data" message or do you mean download from RomUlation? If you mean download from RomUlation then you will not be able to download The Sims game no matter what.

Yeah sorry about that..... I do mean plat it on the R4 as with the cannot access data message.
Thanks again