I no longer run sims 4 on Orgin after the update to ea and I have the same issue. I transferred my mods, tray and saves all to my sims on my new pc that runs windows 10 and I have no clue how to uninstall sims 4 legacy edition or just switch to the 64 bit.
The legacy edition was cancelled more than 2 years ago so unless you haven't played the game for that long there is no way you could have the legacy edition.
If you have another issue please start your own topic as this old thread is likely to be locked to stop necro-posting.
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