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conan install spirv-tools/2021.3@ --build=spirv-tools --profile=C:\J\w\BuildSingleReference@2/71680/39c90cf7-b48c-4180-aaa3-b6f0c3ed7dac/profile.txt
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Configuration:
[settings]
arch=x86_64
build_type=Debug
compiler=Visual Studio
compiler.runtime=MTd
compiler.version=16
os=Windows
[options]
spirv-tools:shared=True
[build_requires]
[env]

spirv-tools/2021.3: Forced build from source
Installing package: spirv-tools/2021.3
Requirements
    spirv-headers/cci.20210811 from 'conan-center' - Cache
    spirv-tools/2021.3 from local cache - Cache
Packages
    spirv-headers/cci.20210811:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    spirv-tools/2021.3:00a157dfa66d5ed75b29700d4a9df3c9e508238e - Build

Installing (downloading, building) binaries...
spirv-headers/cci.20210811: Already installed!
[HOOK - conan-center.py] post_package_info(): [CMAKE FILE NOT IN BUILD FOLDERS (KB-H019)] OK
[HOOK - conan-center.py] post_package_info(): [LIBRARY DOES NOT EXIST (KB-H054)] OK
[HOOK - conan-center.py] pre_source(): [IMMUTABLE SOURCES (KB-H010)] OK
spirv-tools/2021.3: Configuring sources in C:\J\w\BuildSingleReference@2/s\366ca0\1
Waiting 5 seconds to retry...
spirv-headers/cci.20210811: WARN: Lib folder doesn't exist, can't collect libraries: C:\J\w\BuildSingleReference@2\.conan\data\spirv-headers\cci.20210811\_\_\package\5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9\lib
spirv-tools/2021.3: WARN: Build folder is dirty, removing it: C:\J\w\BuildSingleReference@2/s\295980\1
spirv-tools/2021.3: WARN: Trying to remove corrupted source folder
spirv-tools/2021.3: WARN: This can take a while for big packages
ERROR: Error downloading file https://github.com/KhronosGroup/SPIRV-Tools/archive/refs/tags/v2021.3.tar.gz: 'HTTPSConnectionPool(host='codeload.github.com', port=443): Max retries exceeded with url: /KhronosGroup/SPIRV-Tools/tar.gz/refs/tags/v2021.3 (Caused by ResponseError('too many 503 error responses',))'
ERROR: spirv-tools/2021.3: Error in source() method, line 82
	destination=self._source_subfolder, strip_root=True)
	ConanException: Error downloading file https://github.com/KhronosGroup/SPIRV-Tools/archive/refs/tags/v2021.3.tar.gz: 'HTTPSConnectionPool(host='codeload.github.com', port=443): Max retries exceeded with url: /KhronosGroup/SPIRV-Tools/tar.gz/refs/tags/v2021.3 (Caused by ResponseError('too many 503 error responses',))'