Found a beta version as follows: ActiveTcl 8.6.0.0b2 ActiveTcl Downloads - Tcl for Windows, Linux and Mac | ActiveState :)

The latest version of ActiveTcl 8.5 is ... ActiveTcl 8.5.8.1 ActiveTcl Downloads - Tcl for Windows, Linux and Mac | ActiveState , which is the most recommended version for a daily use.

Using ActiveTcl 8.4.19.0 for Ruby/Tk library...The latest version of ActiveTcl 8.4 is ... ActiveTcl 8.4.19.3 ActiveTcl Downloads - Tcl for Windows, Linux and Mac | ActiveState No time to update to ".3"!!!