Update readme

README.md

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-# Notice
-
-Patcher is currently broken after 1.21 game update, working on a fix.
-
 # DayZLauncher-UnixPatcher
 
 Provides unofficial fixes for the DayZ launcher when running in Linux/Proton.
 
 Features:
 * Fixes being unable to install/enable workshop mods
-* Fixes repeated BattleEye EULA prompts
-* Fixes launcher options not saving (default page, etc.)
-* Fixes parameters not saving
+* ~~Fixes repeated BattleEye EULA prompts~~
+* ~~Fixes launcher options not saving (default page, etc.)~~
+* ~~Fixes parameters not saving~~
 
 Fixes workshop mods not installing in the official DayZ launcher when running under in Mono runtime (Wine/Proton).
 
+## Upgrading
+
+If you are upgrading from a previous version, make sure to (in order):
+* delete `steamapps/compatdata/221100` folder
+* verify game files
+* start the game launcher once
+* apply the patch using `./bin/DayZLauncher.UnixPatcher`
+
 ## Notice
 
 **I am not affiliated, associated, authorized, endorsed by, or in any way officially connected with Bohemia Interactive, a.s., or any of its subsidiaries or its affiliates.**