Add the force-reinstall (-f) flag to do it unconditionally.

I can confirm, that, using "fresh/clean" Strawberry Perl 5.28.0.1 -- i.e. your version -- the installation of IO::Async fails. That's not the case with Strawberry Perl 5.28.2.1 though, where IO::Async installs OK.

To follow AM's advice, upgrading Socket issuing cpanm Socket under 5.28.0.1 did fix the issue.

I see, however, that

t\70future-io.t .............. skipped: Future::IO is not available
[download]

in my case, but not in yours. How come this distribution was installed at your side? It's not required for IO::Async (nor Future, etc.) and its pod says it can be problematic with Win32. I'd suggest to uninstall it, or at least to backup/rename ImplBase.pm, to allow "clean" (i.e. unenforced) IO::Async installation.

It worked. Thanks!!! Actually when I was initially installing one of the WebSocket modules, the module Future::IO was marked as a dependency which was not being resolved by CPAN installation process. I manually installed Future::IO. Upon your advice I uninstalled Future::IO via cpanm and then installed IO::Async::Loop which worked.

So it comes down to four things: First, Socket was to be upgraded. Second, Future::IO was unnecessary installation. Third, no bug in tests. Fourth, no problem with Perl distribution and windows 10 platform. :)

It worked Thanks!!!. Actually I installed manually the Future::IO module as it was marked as a dependency of a websocket module and was not being resolved by CPAN process. I uninstalled it via CPANM and then reinstalled IO::Async::Loop which worked.

So it comes down to four things:

1. Socket wa sto be upgraded.
2. Future::IO was unnecessary.
3. No bug in tests plans.
4. No problem with Perl distribution and windows platform.
Probably force installed also did the trick.