The following should install Tk on SP-5.40.0 and earlier: 
cpanm https://github.com/StrawberryPerl/Perl-Dist-Strawberry/releases/
+download/patched_cpan_modules/Tk-804.036_001.tar.gz

[download]
For SP-5.42.0, you'll need to run: 
cpanm https://github.com/StrawberryPerl/Perl-Dist-Strawberry/releases/
+download/patched_cpan_modules/Tk-804.036_001.tar.gz --configure-args=
+"OPTIMIZE=-Os"

[download]
If any tests fail, you'll need to use force - but all tests should pass, anyway.
If any tests do fail, please report back.

UPDATE:
And, for future, questions regarding Strawberry Perl issues should be addressed to either:
https://github.com/StrawberryPerl/Perl-Dist-Strawberry/issues
or
https://github.com/StrawberryPerl/Perl-Dist-Strawberry/discussions

That way, one gets to ask for (and receive) assistance in a user-friendly way without the requester (and/or responder) having to endure this generally unusable perlmonks platform.

Cheers,
Rob

In reply to Re: On which portable Strawberry Perl will Tk install? by syphilis
in thread On which portable Strawberry Perl will Tk install? by aplonis

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.