You can use the episode selector to skip straight to the final battle with 100% of the enemy item drops, although some optional content will still need to be cleaned up.I was running on JOIplay, maybe is the app that can't run properly. So I will run on PC. (Pretty much I would even start from beginning, since the game is this nice.)
I think the final battle event itself is quite intensive, especially when the main party's HP values reach 500,000. The specific crash point you were at is when you get healed by 999,999 to make sure you have full HP for the next battle, and as silly as it seems, RPGMaker might be so poorly optimized that this makes the program shit itself. The final event did get so large for me that I had the editor crash on me once, losing some progress. It's 50,000 words split into 2 events and 5 tabs total to try and reduce the problems.