: Most fixes in 12.2.2 are compatible with existing saves. However, for the Turkish league credit fix or the Sam Hutchinson data change to take effect, a new game is required.
Here is exactly what got fixed:
Includes minor refinements to the match engine and game stability to improve overall performance. How to Download and Install FM 2012 Patch 12.2.2 The recommended way to update your game is through Steam. Football Manager 2012 Patch 12.2.2 Download
Updating to patch 12.2.2 offers several benefits: : Most fixes in 12
Playing Football Manager 2012 straight out of the box (the vanilla version 12.0.0) presents major tactical imbalances and bugs that can ruin long-term save games. The released by Sports Interactive to address residual engine bugs left over from major data updates. Core Changes in Patch 12.2.2 How to Download and Install FM 2012 Patch 12
Though small in scope, the 12.2.2 update was essential for long-term stability in save games.