I tried to load and use the old Martian model into 17g and it crashes 17g because older model save in different format. Cannot remember if there was an solution so began tinkering.
If I load older model in to 17g then start new model then copy old model and paste into new model then drag bones on to new model it appears to work EXCEPT you have to reassign the bones. I started to do that by comparing old model assignments and transfering to new model will let you know how this works.
If anyone else wants to try here is the new model so far
Mart1.zip