I have a Nokia N810 and would like to load Mer on it.

I have been using the MerInstaller till now and it downloads the mer image file (130+ MB) during every installation. Now that I have downloaded the image to my desktop and have already copied it to the external memory card;

I would like to know if there is a way in which we can use the MerInstaller to take the image from a local file on my external memory card ?