@strategia
Well in the Settings–> Advanced is a textfield having this link.
You can directly modify it there.
Just have a look:

Hope that helps.
Thanks
Hey guys,
I just had the same issue.
In my case, the plugin automatically generated one URL xxx/wp-includes/js/wp-emoji-release.min.js and if you change the baseUrl of wordpress, this URL is not longer valid and the export gets stuck on the last file.
Adjusting the BaseUrl in this path fixed the issue for me.
Cheers