I've had instances where, even choosing Replace on the extraction, some files cause problem, maybe because some names are changed between versions and there's 2 conflicting parts trying to work. Now, I simply don't bother, extract the new version (full) to a new folder and delete the previous one. Saves are being stored in the Local storage (that I now have duplicated on 2 different clouds with hourly updates), so, don't need the old folder for anything.
This is NOT the case with GH. Here I have 4 folders.
GH Part 1 - unmodded and unpatched, GH Part 1 - modded and patched, GH Part 2 - unmodded and unpatched, GH Part 2 - Modded and Patched. Then I have a folder for all the updates (only part 2 is complete, missed several of the Part 1), another for some of the Patches for Part 1, 2 more for mod versions Part 1 (partially) and Part 2 complete. Yeah, I do really take this one quite seriously. Oh, and this is replicated into 3 different drives, they will not probably all fail at the same time, right? RIGHT??? Hmmm...
Do what you need, but can you please tell me where you'll get the 0.20 file from? And why don't you tell us exactly what you downloaded and what you did? Hmmm... Why? Hmmm...
Peace