On macOS 10.14.6, I get 'Forbidden' errors when trying to update emsdk:
./emsdk update
Error downloading URL 'https://s3.amazonaws.com/mozilla-games/emscripten/packages/emsdk_unix_update.tar.gz': HTTP Error 403: Forbidden
Fetching all tags from Emscripten Github repository...
Done. 179 tagged releases available, latest is 1.39.2.
Fetching all tags from Binaryen Github repository...
Done. 90 tagged Binaryen releases available, latest is 1.39.1.
Fetching all precompiled tagged releases..
Error downloading URL 'https://s3.amazonaws.com/mozilla-games/emscripten/packages/llvm/tag/osx_32bit/index.txt': HTTP Error 403: Forbidden
Error downloading URL 'https://s3.amazonaws.com/mozilla-games/emscripten/packages/llvm/tag/osx_64bit/index.txt': HTTP Error 403: Forbidden
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