I haven't had this issue before, but I'm trying to install the games Clever Fox Moxie and Wandering Wolf Trick. I had the same issue with Friendly Bunny Mochi before it eventually worked.

When I download and install it, the installation progress bar goes over half way, then it says install again. When I press install for the second time, it does the same thing. I've tried deleting them from the Downloads tab and I've tried deleting their files before pressing install again.

Can anyone help?

Never mind! Turns out I just needed to make some space for the new games because I didn't have enough.

If anyone else has this problem, check how much space you have left on your computer. You might need to use the Disk Cleanup tool.