This isn't true. 6, 7, and 8 added nothing over 5 that should require you to start a new game. 8 had one bug fix. There's no reason for a new savegame folder at all.ORIGINAL: Canute
I also would really like to strongly request that each beta patch iteration STOP creating its own save folders. Its really quite ridiculous to have a 6, 7, and 8 when only minor bug fixes are being introduced and that directory (which is located in a really stupid place) is now hopelessly cluttered.
noone prevent you to delete all the older savegame folder.
And when a new beta patch comes out its allways better to start a new game, except you want check if a situation at an old safegame still get stuck or this kind.
It's a tedious process to root out all these folders because where this savegame folder is stored (in a user, appdata folder; which, by the way, is hidden by default on Windows systems since MS doesn't want you mucking around in appdata).