On the main application screen, tap “Menu” (the three dots in the upper-right corner of the screen), and select Settings and then the section Virus database update;
Select the Update over Wi-Fi checkbox, and by default, mobile networks will not be used to download updates. If no Wi-Fi networks are available, you will be prompted to use the mobile Internet.

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— The Russian developer of Dr.Web anti-viruses

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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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How to allow or block the use of mobile networks (LTE, 3G, EDGE, GPRS) when updates are being downloaded

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