Downloaded the wrong AKAIO update to my SD card and need to fix

I have just downloaded the AKAIO 1.8.6 to my SD Card.
I thought that this was the download I needed to update my firmware but it seems I have done the wrong thing.(again!)
I started up the NDS and when I try to open it it says Clone 3 "It may not be a genuine Acekard.please contact your vendor or access our website", and I cannot get into any of the games or anything else, this message is blocking access. I have contacted Acekard website but have not had a reply, but meanwhile cannot use the NDS.
Could you please please let me know what I have done wrong and how to fix it!!!
As far as I know this is a genuine Acekard and I have had no problems before...
Thank you!

just delete it off the microsd and put the previous version back on?

Thank you for that, I have just tried to delete what I think is the file and it won't delete. :(