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For game version 1.6.640 , you specifically need SKSE64 version 2.2.3 . Using a newer or older version of SKSE will cause the game to crash on startup. How to Install SKSE 1.6.640 (Step-by-Step)

Are you planning to your game from the latest version to 1.6.640, or are you setting up a new mod list from scratch?

Many modders intentionally "backport" or freeze their game at 1.6.640. This is because the transition from 1.6.640 to 1.6.1130 involved significant changes to the way the game handles plugins (the "Marketplace" update).

Grab the .7z file from the link above.

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Skse 16640 Link «2026»

For game version 1.6.640 , you specifically need SKSE64 version 2.2.3 . Using a newer or older version of SKSE will cause the game to crash on startup. How to Install SKSE 1.6.640 (Step-by-Step)

Are you planning to your game from the latest version to 1.6.640, or are you setting up a new mod list from scratch? skse 16640 link

Many modders intentionally "backport" or freeze their game at 1.6.640. This is because the transition from 1.6.640 to 1.6.1130 involved significant changes to the way the game handles plugins (the "Marketplace" update). For game version 1

Grab the .7z file from the link above.