Tome and Blood has been updated to version 1.2 with technical improvements. The multiclass sorcerers and Arcanist kit could, under certain circumstances, cause the game engine to freeze up. There have been very easy player workarounds to avoid those circumstances, but as of version 1.2, that is no longer necessary.

You can download the mod here, and read the Readme here.

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The Unearthed Arcana series of mods represent a number of changes and additions to classes in the Baldur's Gate games:

• Might & Guile offers new abilities, new kits, multiclass kits, and various class improvements for fighters, rangers, thieves, and bards.
  
• Tome & Blood offers new sorcerer and wizard kits, multiclass kits, and various improvements to game mechanics for mages and sorcerers.
  
• Faiths & Powers offers a slew of new priest kits, more divine spellcasting options, several alternative sphere systems, new kits and archetypes for paladins, kitted multiclass clerics, multiclass druids, and multiclass shamans.
  
• Will to Power adds a heavily 2E-inspired point-based psionics system to the game, with four different psion kits and wild talents for non-psions.
  

Taken together, these mods represent a unified vision of how all the game's classes can operate and interact in new and improved ways. However, because everyone's taste is different, these are designed to be as modular as possible, allowing players to pick and choose from among different tweaks and improvements. Compatibility with other mods is maximized wherever possible.