In the Desktop program just start a new return. Go to File - New. Then the first thing it will do is ask if you want to transfer from 2019. You need to have the .tax2019 on your computer for each person's return you want to do. Where are the 2029 returns?
Also if you do another return for someone else like your child and their name is the same or similar to yours then it might overwrite your return. You have to save each return with different names so you can tell them apart. Like if your name is John and your son is also named John it will save them with the same name so the second one will overwrite the first return. Go to File-SaveAs and give it a unique name.
