There should be a widget to show the most popular posts

JetPack already does this.

Use the Appearance > Widgets > Top Posts & Pages (jetpack) widget to any widget area.

Sorry, Maybe my eyes are having problem. I do not see any widget like that. There are only Recent Post which is default widget by WP and Top Rated which is from PollDaddy I think….
Anyone else see Top Posts & Pages (jetpack) widget?

Do you think my theme could cause the Top Posts & Pages missing?

I would have got you a screen shot of the widget. But I have currently disabled JetPack due to this issue:
https://www.ads-software.com/support/topic/jetpack-causing-twentyfourteen-themes-featured-content-to-break?replies=2

Can you post a screenshot of what widgets you see?

Hello,

There are 5 images so I will have to post it as gallery

https://postimg.org/gallery/9545xewa/

Many thanks for your support

Strange!
I use Jetpack on WP Multisite, at some child-sites I can see Top Posts & Pages (jetpack) but for the others, I can not see it. Maybe there is a button to turn it on or off and I accidently turn it off somehow?

Click on the JETPACK link under the Dashboard link. It will show you a list of all Widgets etc that you can activate or deactivate. This must be deactivated in the site in question.

@abhijithrao do you mean Jetpack modules? The possible module that is concerned is WordPress.com Stats since the Top Posts & Pages is a part of WordPress.com Stats module. I have turned it on, still not seen the Top Posts & Pages widget.

I turn WordPress.com Stats module on all of my sites but I only can see Top Posts & Pages at some sites.

Could you make sure that you’ve activated the “Extra Sidebar Widgets” module as well? This module includes the Top Posts widget you’re looking for.

yes, Thank you for the very short but helpful answer. It is Extra Sidebar Widgets. You didn’t add a note in the module description so I don’t know. I can see Top Posts & Pages widget now. Too bad it hasn’t been improved, that was the reason I have forgotten about it for 2 years. I ‘ve created a new topic and hope you will consider.

Thank you,