Thanks. I've gone ahead and installed it. Having checked the signature my understanding is I have done what is necessary. I was just a little cautious because last time I overrode a UAC Error I ended up installing a load of spyware (that was a Filezilla download from SourceForge).
That was probably because it was downloaded through SourceForge, I've heard that their downloads are infamous for containing spyware. Like I said before, if file checksums and signatures work out, you shouldn't run into any problems.