Hello Jack,
TBR 4.1 predates the earliest version that Softrak has on file. Softrak purchased TBR at the 6.05C level. Although we have some earlier versions and some tools that are used to convert data in the Database Repair Department, I do not have a program to use in testing. I can not offer you any guarantees that this program will behave as you hope it will.
I suggest that you make a copy of the data and test year end on the copy.