Install:

Go to the Spyro Reignited Trilogy movies folder (~\Program Files\Steam\steamapps\common\Spyro Reignited Trilogy\Falcon\Content\Movies) and copy everything in there. Once you've copied the Reignited movies I recommend putting them in a separate 'Reignited Movies' folder for backup. Do not delete anything in the 'Movies' folder, this mod does not replace all files in that folder.

Once you have the Reignited movies copied into a backup folder, copy the Classic movies from this mod, paste them into the game's 'Movies' folder and replace all files.

Now you are good to go, enjoy!

Uninstall:

Simply replace the classic movies with your backup Reignited movies.