$ asdf install conftest 0.20.0
[2021-09-10 10:00:50] INFO: Downloading [conftest] from https://github.com/open-policy-agent/conftest/releases/download/0.20.0/conftest_0.20.0_Linux_x86_64.tar.gz to /tmp/asdf_xPEsUOJK/sub/conftest_0.20.0_Linux_x86_64.tar.gz (install_tool)
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 9 100 9 0 0 98 0 --:--:-- --:--:-- --:--:-- 98
[2021-09-10 10:00:50] INFO: Creating bin directory [/home/myoung/.asdf/installs/conftest/0.20.0/bin] (install_tool)
[2021-09-10 10:00:50] INFO: Cleaning previous binaries if any (install_tool)
[2021-09-10 10:00:50] INFO: Extracting archive (install_tool)
tar: This does not look like a tar archive
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now
Its trying to use https://github.com/open-policy-agent/conftest/releases/download/0.20.0/conftest_0.20.0_Linux_x86_64.tar.gz but it should be https://github.com/open-policy-agent/conftest/releases/download/v0.20.0/conftest_0.20.0_Linux_x86_64.tar.gz with a v on the /download/v{version}/
Its trying to use
https://github.com/open-policy-agent/conftest/releases/download/0.20.0/conftest_0.20.0_Linux_x86_64.tar.gz
but it should behttps://github.com/open-policy-agent/conftest/releases/download/v0.20.0/conftest_0.20.0_Linux_x86_64.tar.gz
with av
on the/download/v{version}/