v0.81av2 contains all that is needed and does not require any patches. There is one typo fix you can download, but it isn't necessary and isn't really a patch.
The thing about crashing after battles is probably the reinforcement CTD. In EB 0.7x it was the biggest bug in the game and happen all the time. Currently it has been reduced greatly and shouldn't happen too many times. If it does happen for a particular battle, you can try refighting the battle and it probably won't happen again. If you don't want to do that or it crashes again, you can always you auto calc (or auto_win) to resolve the battle. After playing 0.7x for so long, I avoid as many battles that include more than two armies as much as I can.
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