1. No we don't change the end of FNV in any way to be honest TTW does not make any changes to FNV accept for our transit method to get you from D.C. Which is a train station that leads from D.C. to Freeside and, back. We have also edited the FNV tutorial for the D.C. Start. It will now skip the Character creation portion of the tutorial allowing you only to change your name, face and hair.
We do intend on opening up an FNV start at some point but for now we are only in Alpha and testing from D.C. to NV.
2, The installation process is simple,
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have a clean unmodded install of Fallout 3
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have a clean unmodded install of Fallout New Vegas
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extract the patcher and all it's files to a new folder on your desktop
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Run the patcher.exe
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if it doesn't find your games direct the patcher to where your games are installed.
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For best results choose a install directory in a temp folder on your desktop and hit install.
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after the install is finished move the contents of your temp folder to Steam\steam apps\common\falloutNV\Data
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Set your load order according to your FAQ in NMM or FOMM and launch the game.
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for best results start a new game, don't try to use an old save from FO3 or FNV things can go wrong if you do.
Feel free to come into the public chat if you have issues, the people in our little community are mostly more then willing to help you get things working.