Some community members on Steam Discussions have shared zipped archives containing save folders for every story mission.
The r/farcry subreddit is a frequent hub for players sharing files for specific turning points, such as right after the first tower or before major story choices. Far Cry 4 Mission List (Ordered by Act) far cry 4 save file for each mission
If you are looking for a specific save point, here is the sequence of main story missions in Far Cry 4: Far Cry 4 missions Some community members on Steam Discussions have shared