Page created from Dreamweaver template is not picking up CSS formatting

Hi. I am using a free web design from Templatemo. When I create a template of my own using this design (with all their formating, bootstrap, CSS etc..), the template seems fine. A preview of the template looks great. However, when I then create a new page using that template, it has lost all the CSS formating (spacing, fonts, colors etc). The "live" view on Dreamweaver shows only the HTML coded text, while a preview on a web browser brings up the error message "Save all the files (including related files) to preview.". Please Help!