What I do each time is replace all strings containing wp-content/uploads on my local development path, with the placeholders path on my server.
With SublimeText if your server is localhost, and you put the images on your server in a folder named placeholder you can just select all http://localhost/themename/wp-content/uploads string, and replace with http://yourdomain.com/placeholders/themename.
Then copy all contents inside wp-content/uploads, create the thumbs using placehold.it, upload to your server.
That should replace all path correctly even inside post content, and have your demo content ready to be imported 