I need a prezi video

I had a prezi abojut 5 years ago by a company that is now gone bust. I don't have the source files but i have the main picture files used in the prezi. I need to update my existing prezi with new logo's etc. Im keeping all the audio files the same. I just need a couple of visuals changed, so not sure if i would have to rebuild the whole prezi again or can the existing one be back-engineered in some way? Unfortunetakly the existing vidoe is over 126Mb so i cant use the form to upload it but i have attached some of the pics used in it