I’m having the same issue where after the import screen I see a 404 error message. No posts/images were imported.
I changed my PHP.ini settings to those suggested, I followed this pinned-post step-by-step
http://support.swiftideas.net/forums/topic/having-problems-or-issues-with-xml-demo-content-upload-try-this-solution/ and I still cant it to work. This is very frustrating!
Any help would be much appreciated thanks