1st Step: Required DownloadsĭVDs: Spectrasonics.Omnisphere.2.DVDR.D1.PROPER-R2R and D2 to D8 DYNAMiCS version. NOTE: I already had Omnisphere 1.5.4 installed, and had no problem during the installation, it actually overwrites the files in STEAM, but if you want to make sure, run the program as admin.
So, I'm still seeing people getting errors, and as I installed it without any problem showing up during and after the install, here's an in-depth tutorial.