@Stylikpaylinoran You can use Terminal to search for the file, just in case it's hiding somewhere. Open Applications > Utilities, launch Terminal, and copy and paste this exact line:
find / -name "Version.tag" 2>/dev/null
The command will take a while to finish running, so give it a minute or so even if it's not immediately spitting out results. You'll know it's done when you see the command prompt again. If Terminal does find any copies of the file, please post the full file path here. You can write [username] instead of your actual username, but leave the rest of the file path intact.
If there aren't any copies of Version.tag, then clearly it's not causing the error. In that case, please repair the game in Origin: open your game library, right-click (or hold crtl and click) on the Sims 3 icon, and select Repair. If that doesn't help, please let me know what packs, if any, you've installed, and whether you ever had the 32-bit version of Sims 3 installed on this computer.
@Stylikpaylinoran I'm guessing you're opening the iCloud version of Documents, and that version doesn't have the Sims 3 folder. If you don't mind disabling iCloud, please do so, then manually open Documents > Electronic Arts > The Sims 3.
The other option is to go the long way around. Open a Finder window and click on Macintosh HD, or whatever you've renamed your hard disk, in the left panel. (If you don't see it listed, click Finder in the upper left corner of your screen, then Preferences > Sidebar, and check the box next to hard disks.) From there, open Users > your username > Documents > Electronic Arts > The Sims 3, and then delete Version.tag. This is exactly where Terminal says the file should be.
Once you've deleted the file, please try to play, and let me know whether it works.
