I’m not sure if this is a common issue, but I’m going to share my experience anyway. My issue with the file was two-fold.
1: My SD card was too large to read when attempting the update (64gb). As this was the smallest SD card I owned I had to use Windows Disk Management to create a small partition then format said partition to FAT32. That’s when I ran into the second problem.
2: The file listed above has one tiny issue; when you download the file it saves as home_m25.txt. As is the camera won’t recognize it to flash it. Simply rename the file to home_m25, dropping the .txt.
After that, the camera recovered and it is now back in use. I hope this information will save at least a few people from the headache of figuring this out.