Try installing using the MSI file from http://www.adobe.com/products/flashplayer/fp_distribution3.html
In case you are still facing issues of downloading metafile, could you please let me know whether you are using:
1. connection through proxy server or proxy settings is set in your browser
2. firewall (please specify personal or corporate)
3. connection through VPN
4. OS and browser you are using
Moving this discussion to the Installing Flash Player forum.
I am assuming your operating system is Windows.
You can download the installer from the following link: http://helpx.adobe.com/content/help/en/flash-player/kb/installation-problems-flash-player- windows.html#main-pars_header
After downloading, close your browsers and double-click the installer.