Version 8 of How to make Tcl/Tk work on my computer

Purpose: A starting page for users who know they want/need Tcl, but do not know where to start.

Easiest way is to get a Tclkit (one single file, about 1 MB) e.g. from http://www.equi4.com/tclkit/ . Put it anywhere on your machine. Run it ;-)
Locate and install a binary distribution. You can find a list at the Binary Distributions page and also here: places to find Tcl binaries and sources.
If no binaries available, locate, configure, build, and install from a source distribution places to find Tcl binaries and sources.
Read wiki pages to learn tcl/tk - see Tcl Tutor as well as In the beginning - first stop for someone new to Tcl and Tk, Beginner's Guide to Tcl/Tk, [feel free to add more references here]
Starter Tcl discusses some common software that you will probably find helpful in writing or using Tcl.