Yes if you want to replace them all just delete your entire neighborhoods folder. Launch the game, and it will make a new one. The whole folder, not just the contents.
Yes, go to your save and find the neighborhood number you want to replace (N001/F001/G001...) Remember it! and delete the neighborhood- if you haven't from inside the game.
Which number will tell you which file to find it in. I have the UC and installed it in C drive ~ So, for the neighborhoods- go to ...
Copy the neighborhood number file (N001/E001) that you need and then paste it back where you deleted the old one-Documents\EA Games\The Sims™ 2 Ultimate Collection\Neighborhoods folder
Note: The only neighborhoods that regenerate are the ones that shipped with the game. A neighborhood you made will be lost if you do this. (In case that wasn't clear...)
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Steam: http://steamcommunity.com/id/gonflable/
Which number will tell you which file to find it in. I have the UC and installed it in C drive ~ So, for the neighborhoods- go to ...
N001/N002/N003 - C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Double Deluxe\Base\TSData\Res\UserData\Neighborhoods
E001 - C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Apartment Life\TSData\Res\UserData\Neighborhoods
F001 - C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Free Time\TSData\Res\UserData\Neighborhoods
G001 - C:\Program Files (x86)\Origin Games\The Sims 2 Ultimate Collection\Seasons\TSData\Res\UserData\Neighborhoods
Copy the neighborhood number file (N001/E001) that you need and then paste it back where you deleted the old one-Documents\EA Games\The Sims™ 2 Ultimate Collection\Neighborhoods folder
Steam: http://steamcommunity.com/id/gonflable/
TS2 Graphics Fix Tutorial]