Sony A7R IV Raw File Support in Adobe Camera Raw is Preliminary, Problematic
Adobe Camera Raw Support for Sony A7R IV raw files is preliminary.
Update September 19: support is now finalized.
Color rendition is way off for the A7R IV, such as tint needing to be +25M to +35M and white balance is off too. Not to mention there being no camera profile.
I am unsure how to proceed showing much work since comparing the Sony A7R III to the Sony A7R IV is inappropriate with no solid camera profile.

Adobe Camera Raw support for Sony A7R IV is preliminary as of September 25, 2019