Sys requirements

Hey there,
I would like to upgrade from Halion 3 to Halion 6.

In the system requirements it says “30 GB free HD space (90 GB required during installation)”
My C drive shows 31 GB free and plenty of space on the D drive.
Could the installation succeed?

I know it is a daft question, but I am a computer novice.

Any advice will be warmly welcomed.