in fear of installation

[gura75 0]

Just performed a successful clean install of fsx and pmdgs with sps. I have tried landings at ENVA RWY 09 and RWY 27 both ILS with correct lineup and expected ILS performance. FMC works with AIRAC 1112. (I did a clean install because of major issues with ILS RWY27 ). I'm still not sure what caused it. Should I proceed installing magnetic updates, airac 1113 and pawyare ENVA scenary(makes it more realistic and nice to watch.)? As you understand I'm in fear of messing up ILS navigation if I proceed further. Any suggestions would be appreciated. Can AIRACs be downgraded?

[downscc 1,327]

The navdata cannot affect MSFS ILS fidelity, in fact, only the PMDG modules are looking at it. MSFS is not aware of it.Most common ILS tracking problem is due to a registry error that is easily fixed with the registry repair tool from Flight1. I would proceed and if there was a problem try to note what seemed to be the cause.