Saving downloaded videos externally

So, I purchased some movies and TV shows from iTunes before the Catalina Update and I downloaded them and then, saved them to an external hard drive. Since the update, I am unable to play any of the videos through Quicktime and they can't be opened in the new TV app. This app is great and all but I have no access to wifi at certain times and not enough space on my laptop to store all the media I want to, hence, the external drive. Is there anyway that I can still access and play these files?

Thanks.