There were numerous issues:
1) When I launched merge too it indicated it couldn't be used until fully installed. There were 7-8 popups that required me to hit OK for and they were the exact same message. It took 5-10 mins until I could use the tool but no progress notification.
2) I tried to merge several PDFs together and when completing the process it indicated a failure but no reason for it.
3) I then tried an online tool and got a similar issue but it indicated that the failure was because the PDFs contained editable fields.
4) I found a solution but a very time consuming one. I loaded each PDF with editable fields and printed it to PDF (to make them no longer contain editable fields). After I tried to merge the PDFs and it succeeded. The software should warn about the issue and describe the solution and what steps to take. It would be even better if the software could prompt to ask if this is what you want to do and do it for me.

I must say that I'm very unimpressed with Adobe lately and will not be using its software when/if possible. I will instead use Chrome or Firefox PDF viewers and GIMP instead of Adobe Photoshop.

Finally, I need to figure out how to make sure I don't get charged for trying out the free 7 day trial without getting charged. If that takes longer than 1 hour for me to figure out I'll be VERY uptight.