: Groups dedicated to playing legacy editions (such as Warhammer 40k 4th Edition or WFB 6th Edition) find modern apps lacking data for these defunct systems.

The Nostalgia and Risks of Legacy Roster Creation: Exploring Army Builder 2.2c

In the late 1990s and early 2000s, Lone Wolf Development released Army Builder, which quickly became the industry standard for tabletop wargamers. Version 2.2c was particularly famous because it was the last major release before the software transitioned to a highly restructured, strictly validated 3.0 system. Key traits of the 2.2c era included:

formats) to understand the specific points costs and rules of a game system. Lustria Online Data Files and Compatibility Availability

If you are having trying to run older software?