Use the command download_depot 1229490 1229491 [Manifest ID] to download a specific version. For example, version 15d uses manifest ID 6666720363269022893 .
: You will receive a .zip file. Right-click it and select Extract All . Once extracted, open the folder and run ULTRAKILL.exe . download-ultrakill-the-games-download-exe
Some players download specific older versions for speedrunning or mod compatibility using the Steam Console. Use the command download_depot 1229490 1229491 [Manifest ID]
: Visit the ULTRAKILL Prelude page and click Download Now . Extraction : download-ultrakill-the-games-download-exe