Backward compatible: Many old Oblivion mods still work on Oblivion Remastered
Briefly

The newly released Elder Scrolls IV: Oblivion Remastered does not have official mod support from Bethesda, yet many mods from the 2006 original version work well with it. Players on platforms like Reddit and Discord have found that .esp files created for the old game can easily be used in the Remastered version, albeit with a more manual installation process. Users need to download the appropriate mod files, place them in the specified data folder, and update the 'Plugins.txt' file for successful integration, as confirmed by testing conducted by Ars Technica.
Bethesda isn't officially supporting mods for the newly released Elder Scrolls IV: Oblivion Remastered, but many original mods work with minimal installation effort.
Players have discovered that older .esp mod files from the 2006 version can function effectively in Oblivion Remastered.
While installation requires more manual effort than the original game, mod files are still accessible and functional for the Remastered version.
Players can simply download .esp mod files, place them in the correct folder, and edit the 'Plugins.txt' file to integrate them.
Read at Ars Technica
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