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Trial licenses are bound to a system hash. During the OS update process, it changes, so you won't be able to use the old trial key any longer. To solve this, repeat the process of obtaining a trial license: request a trial version (you can use the same email address as before), get a new key, install the application and activate it. You can request a trial license only twice—if this limit is exceeded, you will only be able to get a new trial version next year.

This problem does not exist if you have a commercial license—so as an alternative way to resolve this, we recommend that you use the Renewal Wizard and turn your trial license into a commercial license at a 40% discount. The remaining period of the trial license will be added to the commercial license period.


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The Russian developer of Dr.Web anti-viruses
Doctor Web has been developing anti-virus software since 1992
Dr.Web is trusted by users around the world in 200+ countries
The company has delivered an anti-virus as a service since 2007
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Dr.Web © Doctor Web
2003 — 2020

Doctor Web is the Russian developer of Dr.Web anti-virus software. Dr.Web anti-virus software has been developed since 1992.

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