When arises the question about installing windows 10 via Pendrive, It is very very much necessary to use a reliable virus-free iso file of WINDOWS 10. Normally we download it from some torrent site, but there might have a virus. 

Now I want to see you the tricks of  How to download Windows 10 from the official website. And it's totally safe.

STEPS TO FOLLOW:

01. Go to Download Windows 10 website. 

02. Under Create Windows 10 installation media, click "Download tool now".

03. Run the program.

04. Accept MICROSOFT SOFTWARE LICENSE TERMS.

05. Choose Create installation media (USB Flash Drive, DVD or ISO file) for another PC (Choose Upgrade this PC now, if this is the only PC you're upgrading) and Click Next.

04. Select Language, Architecture and edition and Click next. (Check the Use the recommended options for this PC if you reinstall Windows on the same PC)

05. Select ISO file and click Next.