Adobe Reader won't work with new 10.13.4 update

When I click on the Adobe Reader icon, it looks like the first picture.

After I click on it, it gives me the second picture.

When I went to "Get Info" on this app, this was the copyright information (3rd picture).

It was working just fine until I updated to the new 10.13.4 iOS. How can I get it to work again??? (When I try to update it, the app store doesn't even show it as an option for my computer.)