SaveGame (Alternative game ending; all factions are alive and non-hostile)

Alternative game ending: all factions are alive (except the Institute) and are not hostile toward one another.

This save file has 3 stages: the first save is just outside Vault 111 (you can change your character's settings), one intermediate save is in the Institute (you can change the course of the story), and the final save is for destroying the Institute; the main story is complete and the game's alternative ending is achieved.

The protagonist is female, using my face preset, based on the default preset offered by the game.

The DLCs have not been completed. All companions are in the group (except DLC companions), and Curie has been turned into a human.

The alternative ending, with all factions alive (except the Institute) and non-hostile toward each other, was achieved using this approach:

.1. Before completing the main quest “Reunions,” finish all Brotherhood of Steel quests available at that time in the Cambridge Police Station. Also complete the repeatable quests to find an artifact and kill ghouls (once each), complete Danse's quest to find the recon team, speak with the only surviving Paladin, Brandis, in the bunker, then report back to Danse.

2. Only after that, complete the main quest “Reunions” and move on to the next part, “Dangerous Minds.”

Important: Build the teleporter to the Institute with the Minutemen. Do not complete the Railroad quest “Tradecraft” or the Brotherhood of Steel quest “Shadow of Steel” yet. After visiting the Institute, it should hate you and be hostile. If you really want, you can explore inside and even complete the final main-story quest, “Institutionalized” (find your son). But afterward, since the game allows it, kill someone and run away.

Note: After “Institutionalized,” do not speak with Father. It is best to give the “Taking Independence” quest holotape to Sturges (the Minuteman who helps the protagonist get started with settlement building).

3. After visiting the Institute, you can complete Brotherhood of Steel quests up to the point in “Show No Mercy” where you need to board the vertibird (helicopter). Don't board it. However, pick up all available side quests from the Brotherhood of Steel, but don't complete them.

4. Also complete the Minutemen quests “Defend the Castle” and “The Minutemen,” then start “Nuclear Option,” but don't finish it yet.

5. Move on to the Railroad. Now start “Tradecraft” and complete all its quests through “Randolph Safehouse.”

6. Now complete “Nuclear Option”

The Institute will be consumed in the flames of the explosion of its own reactor.

Aftermath

After that, you will have numerous Railroad quests, but don't speak with PAM, or she will want to go to war with the Brotherhood of Steel. The Brotherhood itself will praise the protagonist (except for its leader, Maxson), and its quests will generally be repeatable missions to kill super mutants and raiders. Overall, the protagonist is loved and respected, and all factions are ready to give them various assignments, so there will be no shortage of things to do.

Installation

Extract the archive using any archiving program and place this folder at the following location, usually “My Documents / My Games / Fallout4 / Saves”: “C:\Users\Username\Documents\My Games\Fallout4\Saves”

Original information source in English: