I had the same problem, the riched20'dll file was missing, it is located in windows/syswow64/ check to see if this dll file is in there, if it is it might be corrupt. If you cannot find it you need to replace this dll file.
I had a clone hard drive and found this dll file and copied and paste it. Turbo tax installed with no problem.
Also there should be riched32.dll file there. I have windows 10 home addition. 😀
