When you step into it like I did in Chapter 2 of The Footlocker, you have to fix it. I was so busy focusing on the story's timeline that I forgot the timeline of the computer industry did not match what I had written.
In my timeline, Hans invested in software companies before his death in 1967. However the software industry did not start until after his death. I considered changing the timeline but that would created major problems. So I found an alternative approach.
For those of you who have read Chapter 2, I have posted my updated chapter. I changed two paragraphs to have Elsa make the investments in software companies after Hans' death. Everything remains essentially the same except for a minor edit that another reader pointed out to me.
I want to thank everyone that pointed out my mistake so it could be corrected.