I have been using Reckon and predecessors (Quicken) for over 25 years using PC versions of Windows from Win98 thru to Windows 11 Pro (W98, XP, W7, 8.1 and 10 - 32bit and 64bit variations) .
However, for over one year, I have been frustrated by lock ups and freezes when using V31 on my new Dell Latitude laptop using Windows 11 Pro.
Despite many re-installs and frequent reboots, I have tracked down the problem when using a cobbled up DOS database program like V31 with later versions of Windows.
Clearly, the program is unable to clear residual memory functions when closing. The only way I can get any stability is to set the compatibility in Windows to simulate Windows 7 when running V31!
For other users having similar problems, I suggest using the Compatibility Troubleshooter in Windows 11 and use that facility to test and set the program to use Widows 7 to operate it.