My Avast Cannot Upadate

My Avast Cannot Update.
Error Received "HTTP Server returned error "
My version of Avast is the latest which has been installed using avast_free_antivirus_setup_online_a2i.exe.
This is downladed from https://www.avast.com/download-thank-you.php?product=FAV-PPC&locale=en-ww&ppc=a2
The version of windows is 7.

Kindly assist

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