Add alt download for Downloader (#706) #329

Job	Run time
Build SPC Binary for macos-aarch64	1m 20s
Build SPC Binary for linux-x86_64	21s
Build SPC Binary for macos-x86_64	1m 24s
Build SPC Binary for linux-aarch64	50s
Build SPC Binary for windows-x64	20s
	4m 15s

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