The Sims 3 Complete Collection, as referenced, likely includes the base game along with a selection of its expansion and stuff packs, compiled into one package. The specific content can vary depending on the package, but it aims to provide a comprehensive Sims 3 experience.
Yes, but with tweaks.
In the modding community, version stability is paramount. The Mr DJ repack became a "gold standard" for mod compatibility because it standardized the file structure. Modders could write scripts knowing exactly where the Mr DJ installer placed specific files, reducing troubleshooting time for users. The Sims 3 Complete Collection All Sp Ep 2014 Repack Mr Dj