Macbook update Catalina stuck

Hi, I am trying to update my MacBook Pro (mid 2012) from OS X Yosemite(10.10.5) to Catalina. The software was downloaded and installed. I had around 40 GB of free space. Shortly after I started the update, I got a black screen. However, the MacBook is still on and when I click on the trackpad the spinning globe appears and the screen lightens up a bit. This has been going on now for 24 hours. Do I just have to wait (as it is an old MacBook) or is there something else I can do? Thanks!