How many sites you have to go to depends on what you already have.
If you have the software that will install the Stratux image on your mini SD card, you only need to go to http://stratux.me/#download and click the Download button. If I'm not mistaken they keep the latest stable version of Stratux at that link.
Then you use the software to install the .img file on your mini SD card.
If you don't have the installation software, you'll, of course, have to go find that. But once you have it, you no longer need to ger it again.
Personally I'd keep both of these files on my computer so I wouldn't have to go on line to re-flash my cards. I think that if the Stratux is working fine, and you don't add any new hardware, you don't need to update to the latest version of Stratux. i.e. There's no reason to upgrade your software to present IR vision, if you don't intend to get the IR equipment to plug into your Stratux. (I don't know that, or if, they're going to support IR vision, or equipment, it was just an example)
Another idea is to bookmark one of the (probably several) messages from folks far more knowledgeable than me that have explained this whole process, so you can instantly refer back. I doubt, or wouldn't expect, that iFly is going to set up a special page to provide this information to us.