As I was installing midway, I got a pop up box saying it was a corrupt file or something like that. I selected retry button and same message. Then selected ignore and everything installed. Tested the game and runs fine in the beginning. Not sure if I will run into future problems when I decide to play it. Anyone know what was that about?

Check to see if the file you downloaded has the following MD5 checksum:

6a2441bc9922c1b9e65fcd06c20ce223

It might be your download was corrupted. Best to get it out of the way before it messes up your save files.

So I have to delete it and redownload it all over again? I didn't have the same numbers. How does this happen? If I redownload won't I still have the same thing? How to fix?

Packages can sometimes get corrupted during transfer. If possible, try to download the game again.