If downloaded as a .ZIP, you must extract the files rather than running them from inside the archive.

After a successful installation, a new "Wurst" profile will appear in your Minecraft Launcher. Common Keybinds

The installation process for Wurst 6 differs from modern versions:

Wurst v6.13 is a legacy version of the popular Minecraft cheat client designed for the Java Edition. Unlike modern versions that use the Fabric loader, this version was typically installed by modifying the Minecraft versions folder directly or using a dedicated installer. Key Features and Changes in v6.13

Run the "Wurst Installer.cmd" (Windows) or the cross-platform .JAR installer.

This update introduced official support for Minecraft 1.12.2.

By default, the following keys are used to control the client: Wurst 6.13 - MC 1.12.2 Support & More - WurstClient.net

The search for the specific file name "Pobierz Wurst v6.13 MC1.12 OFPlik" indicates a request for the for Minecraft version 1.12.2. Wurst v6.13 was specifically released to add support for Minecraft 1.12.2 . Overview of Wurst v6.13