I have following the problems,what can I do this to update wordpress 5.4.2
Update WordPress
Downloading update from https://downloads.wordpress.org/release/wordpress-5.4.2-partial-0.zip…
The authenticity of wordpress-5.4.2-partial-0.zip could not be verified as no signature was found.
Unpacking the update…
Abort class-pclzip.php : Missing zlib extensions
