How do I UPGRADE a 1 PC Grimefighter license to a 3 PC license?

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I recently purchased Grimefighter for my PC. Now we need it for a second PC. Can we somehow pay the extra $10 to take advantage of the discounted offer of $39.99 for up to 3 PCs or do we have to purchase a separate license for $29.99? Thanks.

[Eddy]

http://www.avast.com/grimefighter

You will need a license for each system.

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Thank you for your reply, but our actual question is:

Can we upgrade our current license from one PC to three PCs by paying the difference of $10 rather than purchasing another separate license for the separate PC a which is $29.99 instead of $10?

Thanks in advance.

[Eddy]

There is no license for 3 systems, only for 1.
GrimeFighter is a separate product, it is not part of avast av.

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Eddy, we have the paid version of Avast on both PCs. I purchased GF mid August. When my wife opens up her Avast it gives the option of purchasing GF for 1 PC at $29.99, 3 PC for $39.99 all the way up to 10 PCs!! 

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[schmidthouse]

Thank you for your reply, but our actual question is:

Can we upgrade our current license from one PC to three PCs by paying the difference of $10 rather than purchasing another separate license for the separate PC a which is $29.99 instead of $10?

Thanks in advance.

I wish you luck with that, but personally I don't think that's gonna fly.
But I've known to be mistaking sometimes.

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check grimefighter bloggs before you do