Firmware upgrade, can't select .img

Hello, I'm trying to upgrade a 5500AC2 to 1.15, first time applying the upgrade and it won't let me select the .img file. I'm not sure if this is a Mac issue or just user/Pebkac so I thought I would ask her first as a search has not returned anything.


The .img file is greyed out and I can't select anything, what am I doing wrong TAI

 

Unzip it.

 

It is unzipped, the uncompressed files are on the right, the part of the left is a folder

 

Figured this out, after doing some investigation I found Spacelogic was telling the browser it wanted a .lmup file. A quick search for that and I discovered I was using the install updates function not the install firmware function.