Reinstalling purchased avast s/ware onto new computer - HELP please!

Avast Business Avast Server Protection
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I have purchased a new computer but am having problems reinstalling avast (purchased) antivirus software into new PC. Avast have emailed me with a license number, but have not been successful in following their instruction to reinstall paid for avast product. Any clues from a computer savvy operator would be greatly appreciated, thanks. Jen

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  • Which avast!..?? (Pro/IS/Premier)
  • Which version…??
  • OS…?? (32/64 Bit…? - which SP…?)
  • Other security related software installed…??