I've tracked this issue to .meteor\packages\materialize_materialize\0.97.7, as it seems to be the only place that uses fourseven:scss:
When trying to run Meteor on Windows:
=> Errors prevented startup:
While downloading fourseven:[email protected]...:
error: Command failed: C:\Local\.meteor\packages\meteor-tool\1.4.0\mt-os.windows.x86_32\dev_bundle\bin\npm.cmd rebuild --no-bin-links --update-binary
Cannot download "https://github.com/sass/node-sass/releases/download/v3.2.0/win32-ia32-46_binding.node":
HTTP error 404 Not Found
I see that win32-ia32-44_binding.node is available, maybe that one can be used instead?

Can you please help? :(
I've solved the issue by commenting out materialize:materialize from packages, then adding fourseven:scss and meteor started properly, as I expected, since it took the latest version of scss which is 3.8 something. Then I uncommented materialize:materialize and crossed my fingers. It worked.
@cope Thank you for opening this issue. As you found in meteor/meteor#7526 this is due to (this pacakge's) dependency on fourseven:[email protected] in materialize. fourseven:scss made (necessary) changes to work with Meteor 1.4. In addition, Version 3.2.0 of fourseven:scss has a cross-dependency on the same version of [email protected] which is over a year old. For some (newer) operating systems like Ubuntu 16.04, the installation of this package will fail entirely because the 3.2.0 bindings aren't published for all platforms, requiring users to have their own compiler toolchain.
Changing materialize:materialize to use fourseven:[email protected]_1 and bumping the release version would be the the fix for the rest of the Meteor community who are also experiencing issues. I'm not familiar with Materialize but hopefully someone can see this through.
Fixed in 0515646187f8f17b4e9cf58143b133fa90504ae3
Most helpful comment
I've solved the issue by commenting out
materialize:materializefrom packages, then addingfourseven:scssand meteor started properly, as I expected, since it took the latest version of scss which is 3.8 something. Then I uncommentedmaterialize:materializeand crossed my fingers. It worked.