I have same Dell than you and succeeded in installing this new version by downloading the ICS_Ds64.zip from Intel download site. Once you have it, unzip it in a temp folder. Then go to your wireless card 'properties' -> 'configure' -> Driver -> 'Update driver' then select 'search for a driver on my computer' and tell Win7 the temp folder you unzipped the driver.
Let Win7 work and there it is, you are in 18.104.22.168
Thank you very much Slywan, everything works perfectly now.