Hey! Just to clarify: the web version is the browser-play version on the itch page, so it isn’t something you download as a ZIP.
If you want a downloadable copy, use one of the Windows / Mac / Linux downloads on the page instead of the web build. If the itch app/launcher is giving you extractor errors, you should be able to skip the launcher entirely and download the ZIP for your platform directly from the game page.
If you’re still having trouble, let me know which platform you’re on (Windows/Mac/Linux) and I can help troubleshoot.