What's the proper way of updating themes (e.g. Farms 133 Theme Pack)?

So I tried updating to the latest version of Farms 133 Theme Pack. What I would usually do when I update this theme pack is I would do it through the use of an ftp client and would just upload the themes directly to the theme's folder. When I tried checking the themes on my dashboard, it says that I still need to update the theme. The current version is 1.3.7.2 and it's telling me to update to 1.3.7.2. This is the second time it happened. The first one was resolved when I re-installed the WPMUDEV dashboard plugin and re-uploaded the theme pack again. I tried to mimick what I did before but to no avail, it still says I need to update.

Am I doing something wrong here? Advice anyone?