windows 11 from windows 11 preview

Hello i want to install the windows 11 from windows 11 insider preview, i downloaded the windows 11 installation assistant and the ISO file, but when i press accept and install it takes me to,
the section "choose, what do you want to keep", and i can only choose "nothing (everything will be deleted, files & apps"

I cannot click the "Keep personal files and apps"
and says in the bottom:
"youre files, apps and settings cannot be saved, because your windows is saved in a folder wich is not supported, or you try to intall an older version of windows"

I dont want to make a clean install of windows.