two questions - additional homes, and downloading expansions

try in live mode click on a house and see if the option to purchase shows up there or map view

also please take note

the layout of the games has been changed check that first

  http://answers.ea.com/t5/The-Sims-3/FAQ-New-Origin-Layout-for-The-Sims-3-Expansion-Packs/m-p/4641393...

if your games are missing after that contact CS

http://help.ea.com/en/article/contact-ea-help/

http://help.ea.com/en/contact-us/new/