Does not install

[manivista]

First try

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Installing Plugin from uploaded file: sendywpcf.php
Unpacking the package…

The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature

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Second try

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Installing Plugin from uploaded file: sendywpcf-master.zip
Unpacking the package…

Installing the plugin…

The package could not be installed. No valid plugins were found.

Plugin install failed.

[weheartgames]

Try unzipping it first and just uploading the folder. Worked for me. I don't think the zip file was intended to be uploaded using the installer.