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How to fix "Not in GZIP format" error

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Ever gotten this error?

java.util.zip.ZipException: Not in GZIP format
Bot failed to initialize! If you are running OSBot from command-line, ensure that the world you entered is valid! If the world you entered is valid, please check the OSBot forums for online/offline status

This is caused by the OSBot client failing to download the OSRS gamepack properly, possibly a firewall issue but to fix this you can download the gamepack manually every Thursday and add it to the client.

To fix manually:

  1. Go to http://oldschool.runescape.com/jav_config.ws
  2. Find the lines beginning with codebase and initial_jar example: https://i.imgur.com/V6alc5G.png
  3. Download the file located at codebase+initial_jar example: Fg5uql1.png
  4. Move the downloaded file to C:\Users\<your username>\OSBot\Data (under windows) OR /home/username/.osbot/Data under Linux/MacOS
  5. Rename the file to client.jar
  6. Repeat these steps every game update

OR you can run one of my scripts to to it automatically:

  • Linux: <under construction>
  • Windows: <under construction>
Edited by ThatGamerBlue
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