Not only can I not get any objects or build or garden cc to show up now that I have installed Seasons but the insiminator is not showing either. I have all the downloads that have to do with people ie; hair , makeup, clothes, saved sims etc showing but no objects or hacks or insimenator.
When installing a new EP, the game resets and disables the enable custom content by default. What you should do is run the game, go into game configuration (the picture of gears) and look for Enabled custom content. Also turn off custom content dialog so that it doesnt pop up again. Next, exit the game.
Once you run the game again, you should see custom content. As for the inseminator, it will be located in electronics catalog. Depending on which version you download, either objects or the insim machine itself.