Hi,
The Windows installer file is available and will continue to be available in the future. We have no plans to eliminate this option as we are aware of the many of you who can't use the Microsoft Store. Having said this, the redesign of the Downloads page is confusing. We are working to make the Downloads section more clear, hopefully before the end of this week. As @DougBrowning indicates, the Windows installers are right now under 'Other versions of ArcGIS Survey123'.
Just to make things simpler, here are the links to the Windows installers:
Again, we are aiming at making the Downloads page more clear very soon. Thanks for your comments!