If you do NOT already have the current USSEP installation file for 1.6.1170 build safely saved somewhere, PLEASE do it NOW before it gets updated!
I am 100% positive someone is gonna start complaining about USSEP only being available to download for version 1.7.99 and up once the mod author updates it. I just KNOW it is coming.
You can criticize and cry foul all you want about this practice, but the reality is that the mod author doesn't share your view and will not change his position. So the only way to protect yourself is to download the current iteration of USSEP installation file and save it somewhere safe before he updates it and makes the 1.6.1170 version unavailable on Nexus.
So... if you are one of the people who haven't or are not planning on updating to 1.7.99 AND does not somehow have the installation file for the current version of USSEP at 1.6.1170 saved somewhere safe, PLEASE do yourself a favor, save yourself the headache, and DOWNLOAD/SAVE it BEFORE he updates! It only takes a couple of minutes.
EDIT: Yes, Nexus DOES archive older versions of mod installation files and you can download them IF YOU HAVE ALREADY DOWNLOADED THEM BEFORE. But seriously, this is only 181 MB file that will take a couple of minutes to download and save. You may think USSEP does not need update, which at the point of this posting, is clearly INCORRECT. You may think NOW saving the file is unnecessary after only a day after the game update. You do you. But don't be sorry later. This is just a generally safe precaution that takes very little time and effort: to make things SIMPLE instead of arguing about the technicalities. The time it takes for you to argue or think or analyze whether having the current installation file saved and be readily accessible at any time is worth it will take longer than simply downloading it somewhere safe and calling it a day with only 2 minutes of your time and a measly 181 MB of storage space.