Support page doesn't work, no response on my comment neither on my emails


I have purchased Navara theme from PremiumLayers, after installing the theme it needs 2 plugins but the installation doesn’t do anything, I’ve gat this message: The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) : Unable to find End of Central Dir Record signature. I tried to reach out the author, no reply on my comment no reply on my emails…and the support page is also dead with this text: Error establishing a database connection.
Any idea what can I try?