While I don't normally comment on strategy advice discussions (I feel player-to-player discussions are more productive here) and a lot of meaningful stuff has already been posted in reply, one thing that surprised me is that nobody is talking about first strikes, even though this is the original issue you're complaining about. First strikes are the key factor between a defender surviving without a scratch to kill 10 more units and some actual damage being done. In a siege stack, I always bring enough archers and recon units to provide meaningful aid - even though they don't usually get to attack, they can be the difference between losing ~3 and ~15 units, or between taking the city or failing. And if you have designated "first wave" units you're considering expendable, with some free XP to spare, it might be a good idea to give them Drill promotions instead of the most obvious City Attack, to ensure they're guaranteed to do at least some damage.
Welcome to the forum. Feel free to ask any questions, technical or otherwise, you might have. I'd be interested to see a link to the original postings that brought you here as well, if possible.
Install a previous version, copy the Assets/Sounds/Tech somewhere, install the new version, copy it over the new version's files.
I do believe we had a mechanic for cultural diffusion through trade routes, but I wasn't sure if it was still working. I guess it is. It's mostly cosmetic anyway, as the amounts shouldn't be large.