Ragnarod
DiabloII.Net Pal
Well, to change between different game versions, you can have different Diablo II folders (which is recommended if you want to run multiple game instances), or use TrenShadow's version switcher (which can be found here, along with other useful files).
Keep in mind that, once you open your characters in a newer version of the game, you won't be able to open them in the older version again (except for 1.10 and 1.11, you can switch between them without problem), so you can go from 1.09b to 1.11, but not the other way round, for example
Hope that helps, if you need any further explanation, just ask
Keep in mind that, once you open your characters in a newer version of the game, you won't be able to open them in the older version again (except for 1.10 and 1.11, you can switch between them without problem), so you can go from 1.09b to 1.11, but not the other way round, for example
Hope that helps, if you need any further explanation, just ask