I have Windows 8.1. I have been using Lotus Organizer 6 for many years and it worked perfectly. Recently, I had to Uninstall Abode Acrobat DC and since then my Lotus Organizer gives issues and does not start. The last error I am getting is : System Error: (ASWAN:526) Undefined ID. I have uninstalled and installed Lotus Organizer 6 and I keep getting the same error.
I would try visiting archive.org and searching for the version of Lotus you have, I was able to successfully install and run Lotus Organizer 6.1 on Windows 10 64 bit with a bit of effort, had to copy over a file from C:\Program Files (x86)\IBM Lotus Organizer 6\Lotus\org6\compnent\ltbubn12.dll to C:\Program Files (x86)\IBM Lotus Organizer 6\Lotus\org6\organize then ran the executable org6.exe from C:\Program Files (x86)\IBM Lotus Organizer 6\Lotus\org6\organize directory in compatibility mode and as an administrator, you can find these options by right-clicking on the org6.exe and left-clicking properties.