The meta data (what you see when you click "More information") does not list platforms, and it is not downloadable via the itch player. This indicates that the files haven't been marked as operating system/platform executables in the project's settings. The itch player only allows downloading of games if the builds are marked as executables for the associated operating system.
These settings are also automatically applied if a butler upload's channel contains platform names. For more information, see "channel names" here: https://itch.io/docs/butler/pushing.html#channel-names