Would sharing activation keys lead to possible malwares?

[margaretgeorge]

Will my Windows 10 computer get infected with malware(s) if I use a friend's Avast activation key (which is usable on multiple devices) to put my computer's Avast product(s) into premium mode, and which had been used on my friend's computer that is still infested with malware(s)?

[DavidR]

1.  Your friends multi user license must be valid and only they can allocate it to you.

2.  See https://support.avast.com/en-gb/article/activate-premium-security-multi-device/#pc

3.  If the license is legitimate then it can be assigned, by the owner, see 2. above.
Otherwise the paid installation would be considered a trial and you would have to sign up for the trial period, 30 days.  After this payment would be expected and you would have had to set that up before starting the trial.

[margaretgeorge]

1.  Your friends multi user license must be valid and only they can allocate it to you.

2.  See https://support.avast.com/en-gb/article/activate-premium-security-multi-device/#pc

3.  If the license is legitimate then it can be assigned, by the owner, see 2. above.
Otherwise the paid installation would be considered a trial and you would have to sign up for the trial period, 30 days.  After this payment would be expected and you would have had to set that up before starting the trial.

The topic of my question was completely missed. I was asking whether using the multi-device activation key on my computer, which was firstly used on the Avast product on a malware-infested computer (in this case, my friend's), would result in my computer getting infected as well.

The Avast softwares of both my friend's and mine's are downloaded from legitimate sources such as Avast official websites instead of shady channels such as "cracking/piracy".

[Pondus]

If you put a usb stick in the infected computer and then in your computer it may be infected

If you have the license in writing, no the infection dont follow the license

[margaretgeorge]

If you put a usb stick in the infected computer and then in your computer it may be infected

If you have the license in writing, no the infection dont follow the license

Thanks. I was worried about the possibility of fileless malware(s) hopping onto another computer if I re-use the licence key on the latter.

[Pondus]

Thanks. I was worried about the possibility of fileless malware(s) hopping onto another computer if I re-use the licence key on the latter.

That is not how it works

Fileless malware usually arrive as a phising e-mail