I understand your wanting to stay with Version 16. That's OK. Just know that you will NOT be able to take your file from Version 2011 back to Version 16 with the images that may be in Version 2011.
In Version 16, images were included within the Family File. With Version 2011, the Images are NOT included in your Family File but are in a < Media > folder associated and links to the images in that folder to your family file.
You can go from Old to New, but in this specific case, you will be missing the Images going from new to old.