Error : installing plugin in logstash

I am trying to install plugin in logstash -7.6.0 It shows below error:

I am download plugin from github :

root@DRTEST03:/usr/share/logstash/bin# ./logstash-plugin install file:///root/Do wnloads/
Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was depreca ted in version 9.0 and will likely be removed in a future release.
2020-04-26T20:25:11.976-04:00 [main] WARN FilenoUtil : Native subprocess control requires open access to
Pass '--add-opens java.base/' or '=org.jruby.core' to e nable.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.jruby.ext.openssl.SecurityHelper (file :/usr/share/logstash/vendor/jruby/lib/ruby/stdlib/jopenssl.jar) to constructor j,ja,java.lang.String)
WARNING: Please consider reporting this to the maintainers of ssl.SecurityHelper
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflect ive access operations
WARNING: All illegal access operations will be denied in a future release
Installing file: /root/Downloads/
ERROR: Invalid pack for: file:///root/Downloads/logstash-codec-gzip_lines-master .zip, reason: The pack must contains at least one plugin, message: The pack must contains at least one plugin

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