I have purchase AVAST on line and received a licence key after the 30-day free utilization. The URL site given on my purchase receipt as http://files.avast.com/iavs4pro/setupengpro.exe and it is a non valid URL. I cannot do the upgrade online. Please advise.
URL works fine for me. Check again in case a server was down.
The link works for me also.
Try right clicking on the link and select, save as or save files as (depending on your browser) and save it to your hard disk to run off-line.
This however, is for version 4.8 Pro and version 5.0 Pro has been released, so you may be better off downloading the 5.o Pro version and converting the 4.8 pro license number you got in the email. There should be no charge for converting to 5.0 Pro.
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avast! 5 Pro, http://www.avast.com/en-gb/pro-antivirus#tab4, click the download button or try this direct link - http://files.avast.com/iavs5x/setup_av_pro_eng.exe.
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avast! 5 Pro license convert from 4.8 Pro license. Try http://www.avast.com/resend-license.php now, fill in the form giving your email and 4.8 Pro License key and they will send the new license file to you (presumably it will check you have a legit 4.8 Pro license first).
How to register avast 5 pro on page 7 - 8
http://www.avast.com/documentation/quick-start-guide-pro-en-ww.pdf