403 Error. Cannot activate after update

Hi, I recently updated the Ratings Widget plugin. There was a message saying I needed to ‘Activate’ it and a new box saying that you needed to connect my account to rating-widget.com and freemius.com. There is a button saying ‘Allow & Continue’. When clicking this button however, I get the following error:

‘403 Forbidden.’

Underneath that is says nginx/1.6.2

In the URL at the top it says:

https://wp.freemius.com/?error=Site+URL+and+referer+address+are+not+matching.

Could you please tell why this is happening? The Plugin worked before the update and I didn’t have to ‘Activate’ it in this way.

Thanks.

https://ww.wp.xz.cn/plugins/rating-widget/