exe versions, execute that program, and follow the prompts.

You can just download that or one of the other. Most people choose the first one (octave-5.1.0-w64-installer.exe) for 64bit systems. There will be several file options there. You can find the installation files for Windows by going to the Octave download page and clicking 'Windows'. To install the latest version (5.1.0 as of this answer, although 5.2.0 will be released very soon): You can have multiple octave versions installed next to each other, the folders will have version numbers to prevent them from overwriting themselves. you can just delete the folder and shortcuts manually. If you used a zip package to 'install' Octave 4.0.3 just by unzipping it to a folder on your hard drive, then no uninstall process is necessary. Otherwise you can follow the directions at this link to navigate through the Settings to the Apps & Features window, which lists everything installed and will provide an Uninstall option. On Windows 10, you can sometimes right click on the shortcut in the startmenu and an Uninstall option will appear. If you used an executable installer, then there should be an 'uninstall' option available. If you want to remove v4.0.3, the complete answer will depend on how you installed that version in the first place.

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