The solution for 2019 is here:
https://support.cch.com/kb/solution/000107040/000107040
The fix for 2018 is here:
Wolters Kluwer appears to be the actual software company that is the H&R Block Business application. Also related is CCH. I just applied both fixes and now every thing is hunky-dory the program opens and my returns are there. These two solutions require downloading a file from Wolpers Kluwer/CCH and following the instructions exactly. Note: My computer did not have the folder "Program Files (x86)" but only "Program Files", but the fix worked. I have an old computer, Windows 10.
Good luck, I hope this works for all.
Hooray! It works after carefully reading the instructions and doing them exactly. Now, is there a patch for 2017? I may never need it but in case I ever have a question from the IRS I want to be prepared.