All the high definition texture packs which were released by John P as well as the community at EidosForums put into one easy to use installer. Updates characters and a ton of other stuff as well. Must have! Original thread where this was released can be found at the eidosforums in "Deus Ex Classic" forum. The download link there was dead which is why I uploaded it here. Note: THIS IS NOT MY WORK
The Download page states that this mod is not compatible with Downloadable game versions like GOG, Direct2Drive etc.
This is actually not true !
You can use this mod with Steam version and GOG version (with little tweaking) and probably many other.
Great tutorial for GOG version is here (just skip all steps for Mac).
If you'll have problem running this mod with Steam version, you can find help threads on Steam forums.