Restart the launcher. It should automatically re-download the missing core files. 3. Use the Gaming Services Repair Tool
Sometimes the launcher gets confused by its own version files. You can force a refresh manually: Minecraft Launcher Error: Couldn't load launche...
: Press Windows Key + I and go to Apps > Installed Apps . Restart the launcher
: Click the three dots (or right-click) and select Advanced Options . Minecraft Launcher Error: Couldn't load launche...