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Hey, all! Thank you for your reports and for those sharing what’s worked! This error is typically caused by going to a region that had the update pushed, then going to a region that doesn’t have the 5.0 update yet. Sometimes, it will go away on it’s own, but I wanted to compile a list of what’s been helping other players.
- Delete the PTR executable.
- On the Blizzard Application, go to the StarCraft II tab.
- Click on Options
then Show in Explorer - Under the Starcraft II folder, delete the StarCraft II Public Test(.exe) file.
- Try launching StarCraft II.If you do not have the Public Test file in the StarCraft II folder, try checking if you have the PTR installed and try deleting the file from there. If the PTR is not installed, please try the other two steps listed here.
- Switch to the Beta Launcher.
- On the Blizzard Application, go to Settings by clicking on the Blizzard logo at the top-left corner.
- Under Settings, go to Beta.
- Click on Switch to Beta.To undo this, you can go to the same place on the Beta launcher and clicking on Switch to Standard.
- Reinstall Starcraft
If there’s anything new that works, please feel free to share and let me know so we can get this added on here 
If the problem persists after these steps, please let us know. If you can include the region, it should let us know if the region may not have patched to the new version yet or if there’s something else we’ll need to look into. As of right now, we’re still awaiting for the CN region to receive the update.
Here is the answer to your curiosity, if you took the time to look up the issue and what was suggested from blizzard. You would understand I am trying to provide as much detail information to whomever need to know.
Curiosity killed the cat.