I recently bought a new MBPro, in which I installed Sibelius 7.5, and in which I believed I had Sibelius 7 Sounds installed since I transferred all my data from my previous computer. It turns out that Sib 7 sounds was NOT installed. I am installing now from a stored installer that I have kept in a separate drive.
However, I see that there is a Sibelius 7.5 sounds download link. Is this a different sound set? My understanding was that it was not, and that there were some updates done only.
I have also downloaded the Sibelius Sounds updater from the Avid site, which I will run once the S7S are installed.
and another for Sibelius 7.5, which I think you already have. If your main installer was the 7.0 version, I don't THINK you have to run both updaters, but it couldn't do any harm to run the 7.0 - 7.1 one first.
Both updaters were merely minor tweaks and bugfixes. The Sounds didn't change.