Re: I lost my sims 3 game can I re-download it?
yes
For Origin
You don't need to re-register again. Simply login with your Origin account from the desktop shortcut of origin the origin you download with the email and password you use for your account my games tab right click the game icon download If it's not there anymore, contact a game adviser also make sure your logging into the right account if you have more than one account if you haven't already download and install Origin to your computer make sure to get the right version PC or Mac
https://www.origin.com/en-us/download
also please take note of the new layout in Origin if your games are missing after that contact CS
sims 3 DLC content hair/clothing/sets/worlds download from your the sims 3 account also make sure to uninstall the lost disk version of the game before downloading and installing the digital version
and see this so as not to loos saves before uninstalling http://sims3.crinrict.com/en/2011/03/faq-what-files-should-i-backup.html