I cannot install Tcl.pm anytime I want to switch installation

huh? You install once and choose at runtime

use lib '/activetcltcl86';

use lib '/activetcltcl85';

use lib '/bitbuckettcl85';

use lib '/bitbuckettcl86';

In reply to Re^5: Link Tcl to a different tcl.dll on Windows by Anonymous Monk
in thread Link Tcl to a different tcl.dll on Windows by Takamoto

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