I do not know ifyou have had a successful uninstall . . but here is the Windows 10 version.
Go to Control Panel, Find Sims4Studio in the list of programs. Right click on it and the Uninstall/Change dialogue opens. Left click and you will be asked if you wish to uninstall. Clcik OK . . and follow any prompts that appear. . . it usually takes a few seconds for the program name to be removed from the list after the uninstall is complete . . so do not close Control Panel until that occurs. Hope this helps. Marg
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