I have tried out the guide given on the official windows phone site and looked into various question posted on this site for that matter, however I'm still failing to do an offline install of windows app via the SD card.
As instructed, I downloaded the xap files from the online store onto my flash drive. Then placed the xap files on the root of the SD Card via Windows Explorer, i.e. after connecting the phone to the PC and doing the old cut and paste.
I did as instructed howeever I still cannot see an SD card option on my Apps> Store. The website suggested that App>Store takes a while to show the SD card option, I placed the xap files last night. Am I doing something wrong? Any suggestions?