Hi there. I am from NRaas and am appalled to think that anyone is being asked to pay to obtain or unzip our mods. This has never been the case and the compressed packages (zips) we provide can always be decompressed using the tools that come natively with both Windows and the Mac OS (usually by right-click once downloaded). We are, however, aware that our mods along with others are and have been hosted by third parties without our permission who may be serving up outdated versions and putting some kind of price tag on them. And there are many forms of malware and unnecessary pay for use software out there that can intercept a computer's ability to work with zipped files. That's unfortunate, but if you have issues working with zips generally perhaps this is something that should be looked at? It's a very common, I would say the most common, form of file compression out there since everyone on any system should be able to work with it without undue fuss or third party tools.
But yes, this is the place to obtain NRaas mods and the support we provide for them is also free. A Wikispaces account and NRaas membership, two steps, are required to post at NRaas and ask for assistance, but there is no charge for any of that either. There isn't even any form of advertising on our site, although unfortunately that may have to change in the future. Yes, we know that Wikispaces is shutting down but that won't affect us until October and we will have moved to our new site by then so any warnings to that effect can be dismissed.
http://nraas.wikispaces.com
And yes, the mods you really want should you wish to pursue this solution are NRaas Traveler, together with Overwatch and ErrorTrap.