Use a torrent or direct download link to obtain the .iso file.

Open the folder labeled TENOKE (located inside the mounted ISO), copy all its contents, and paste them into the main game installation folder, replacing existing files.

~1.5 GB to 2.5 GB (depending on updates included). Source: Available for download on the Game3rb platform. Installation Guide (Standard Game3rb/TENOKE Procedure)

According to the standard installation steps provided by Game3rb:

The specific release tenoke-anyone.there.iso contains the full game packaged as a disc image (ISO). TENOKE Format: .iso

Run setup.exe from the virtual drive and follow the prompts to install the game to your directory.

Right-click the .iso file and select "Mount" (Windows 10/11) or use a tool like DAEMON Tools.