Garmin has removed the 4.0 link so it's not possible to download it anymore. You can obtain it from someone else who has manually downloaded the file onto their PC. What issue are you having with the 4.1? The only thing Garmin said they fixed in 4.1 is the WiFI uploading issue which I first reported a while back. So in theory 4.1 should be identical to 4.0 if your unit didn't suffer from the WiFi issue. I am running 3.17. I only have 3.0, 3.17, and 3.19 on my PC.
What kind of issues are you experiencing? I’m having intermittent connection issues with sensors. This is the first forum i’ve found someone stating they’re having issues.
