So as you may or may not know, Visual Art's Key produced an "after story" for Sakagami Tomoyo called Tomoyo After. This VN was created quite a while back, but recently, an English translation was completed by Doki subs. Now the game is not 100% flawless there are minor errors that may or may not be fixed in later patches. You can learn more about them link.
This is a tutorial for installing the game on a Windows system. Doki has created patches for Mac and Linux users, but I do not own those systems and will not be able to provide help for those system users.