Not sure if you still need it, but this might help: Updated Visual Tcl version to work with TCL/TK version 8.6 https://github.com/hpheidinger/vtcl.vtcl-8.6
This might help: Updated Visual Tcl version to work with TCL/TK version 8.6 https://github.com/hpheidinger/vtcl.vtcl-8.6
New Visual Tcl Development Underway!