Install Thunderbolt Firmware update on 10.8 guest?

PeaSea

Bit poster
I took the precaution of creating a Parallels (9) version of 10.8 when I upgraded to Mavericks because I wanted to continue to run Airport Utility 5.6.1.

However, AppStore on the guest now wants to update the Thunderbolt Firmware - so the question is: is it safe to install this - or will it break the host machine? I am unclear about the separation between guests and the host.
 
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