Insufficient device memory problem

Hi. I want to install World of tanks Blitz on to my android tablet. The games requires a larger memory space than I have on the tablets internal storage. However, I have an external SD card with sufficient size. The game will not download the SD card and I am not able to move it to the SD card either. Upon installation I am asked where I would like to install. The option to install on external SD card is not presented. Sure;ly there is a way I can install on to the card? I hope so because I love this game and since the update I cant play it. Can anybody help?
Many thanks

 

Not all tablets allow this. Sounds like yours does not. Since you never mentioned the brand and model, I could not check.