A lot of vendors are pretty sloppy with their websites (especially hardware vendors), and they don't always bother to post the newest versions there. Or they label them wrong. Or they mark a version as an update, but it's really not ( i.e. they just want to show that they've put out something new). That's one of the reasons we created RadarSync - after working with hardware manufacturers for over 10 years we understand by now what a headache drivers are for them and what a bad job they do about getting them out to customers.
Our engine basically doesn't take the vendor's word for what file version it is - it looks inside the files and labels drivers/updates based on the "real" version, not what they write on their website, but what the engineer who wrote the driver labelled it. That's why we're totally confident in the update versions we post and why we don't suggest relying on the vendors' websites.
