Cannot open file with license for renewal of Avast pro

Avast Free Antivirus / Premium Security
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Firstly, Avast failed to prevent my computer becoming unusable due to a virus. Bear in mind I never connect to pornography, games, music or other sites which may be unsafe.
I had to have the laptop entirely reformatted,with all the hassle that entails.
I contacted Avast for information on how to re-download my paid for programme (paid in September). That was at the very beginning of November. Today is 12 December. In the meantime, with some difficulty I finally received the information relating to my purchase plus a link to re-install. However, no license was included. It seemed to be only the free version. Many mails and much time wasted whilst I’m told by various different customer support women to phone the US for help, I still do not have access to the license which was sent more recently. The license will not open in the email. I cannot phone free US or other numbers as I am in Turkey, which I’ve told them several times.
So far I’m very unimpressed indeed with Avast.
The computer shop installed a free version of McAffee which seems to be working better than the paid for version of Avast ever did! I think it was a waste of money.
I still have no idea how to open the license file for Avast and have received yet another message, from yet another support lady, to contact this forum. So I am here doing that.
Anybody got any useful ideas? Thanks for reading.

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Bear in mind I never connect to pornography, games, music or other sites which may be unsafe.
You dont have to ... there are no 100% safe sites on the net, safe today can be hacked tomorrow
Firstly, Avast failed to prevent my computer becoming unusable due to a virus.
No security program have 100% detection or zero false positives
The computer shop installed a free version of McAffee
McAfee dont have a free version .... (unless something has changed)
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Avast failed to prevent my computer becoming unusable due to a virus
100% detection/prevention does not exist.
Bear in mind I never connect to pornography, games, music or other sites which may be unsafe.
There are lots of other ways a system can get infected.
I had to have the laptop entirely reformatted
Very likely there was no need for it. Removing the infection would likely have been possible.
The computer shop installed a free version of McAffee
McAfee doesn't have a free version.
I still have no idea how to open the license file for Avast and have received yet another message, from yet another support lady, to contact this forum
That sounds like you didn't contacted avast at all. Did you submitted a ticket ?

And for the license and install of avast.

  1. Download avast
    https://forum.avast.com/index.php?topic=179855.0

  2. Have the license resend.
    https://www.avast.com/resend-license-paid.php

  3. Remove McAfee completely
    http://www.ache.nl

  4. Install avast

  5. Double click the license file.

https://en.wikipedia.org/wiki/Avast_(software_company)

In 1997, ALWIL Software licensed the Avast antivirus engine to McAfee for use in its own line of McAfee VirusScan antivirus products
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Before you install avast any previous used AV must be removed

Uninstalling a third-party antivirus software https://www.avast.com/faq.php?article=AVKB11#artTitle

How to Install Avast Internet Security 2016 https://www.avast.com/faq.php?article=AVKB1#articleContent

How to activate Avast Internet Security 2016 https://www.avast.com/faq.php?article=AVKB157#articleContent

How to do videos https://www.avast.com/faq.php?q=video&authenticity_token=WyLrcHzWGOfP3ElVxqjpYVx8Zwvl%2FQu8Dpqp4C%2Fc32c%3D#searchForm

any help in this?

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More videos on Avast 2016: https://www.youtube.com/playlist?list=PL1_9cbkt8g20HZnTFqR076tswz4HSBJzi