This happened to me! I was worried about being able to start week 3 without the time travel component, and I was going to start digging through the debug menu to find the metals and try to remake it, and ended up finding the time traveling component itself. So as long as it says week 2 is completed and you have access to all the rewards, you can literally just do "testingcheats on" > bb.showhiddenobjects and after scrolling for a little (filtering just base game helps a lot) it should come up. I placed it on the lot and was able to complete all of week 3's challenges as normal.
Assuming all our menus look the same, the debug stuff starts right after the windows in "show all" and the component is just before all the baby food icons. When it places it will look like a package and your sim can click on it and choose add to inventory in live mode.
Also I did this after also deleting the accountDataDB.package file if that helps!
