I've tried updating today to 6.20 on two different computers I've received the same error. I even did a complete reinstall of HeroLab on one of them and still got the error. After the error Pathfinder will not open.
HeroLab.exe has encountered an error and needs to close.
Please email a DESCRIPTION OF WHAT YOU WERE DOING, in as much detail as possible, along with this message, to
support@wolflair.com. PLEASE NOTE: Unless you tell us what you were doing, we won't have enough information to fix this problem!
Right click and choose "Copy to Clipboard" to copy these details, or you can find them in this file: C:\Users\Doug\AppData\Local\Temp\lwderror3536.txt
C:\Program Files (x86)\Hero Lab\HeroLab.exe
4.0b 314
major: 6, minor: 1, build: 7601, platform: 2, version: Service Pack 1, spmaj: 1, spmin: 0, suitemask: 00000100, type: 1
ACCESS VIOLATION
Address: 0x77cae41b
Type: bad write