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> Is it proper to move directly from 8.3 to 8.6 version? Or should I upgrade to TCL 8.5 as TCL 8.6 is still beta version.
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Tcl 8.6 is an improvement with extra functionalities and should work with unchanged code. Tk is more a problem with unsupported functions that has been replaced by other commands, just see the file "unsupported.tcl" in 8.6 installation. The binary extensions are more a problem for instance BLT needs to be replaced, Tcom is no more supported, not all extensions have 64-bit version .... As about an EDA software, I suspect you don't have only Tcl or Tcl/Tk under the hood !
Tcl/Tk 8.6.1 is not in beta and is quite robust and has nice improvements for EDA such as text with angle in the text widget... If you need Tk.
Regards,
Olivier