Safe for 4.0.1

I can confirm that this works in 4.0.1.

Dear Chris,

Thanks for your reply.
Ik know it works but is it safe to use?

The definition of “safe” is relative to your theme and other plugins.

I test every off-the-shelf plugin in a local development installation first to check for PHP errors, memory usage, activation/deactivation problems, Leave No Trace score, and general compatibility with other plugins and stock themes I commonly use.

Looking at the code for this plugin, you will see it simply flips a switch that enables link manager. The link manager module within WordPress has not changed since 3.5 when they, for some reason, disabled it by default.

By the way, I reached out to @nacin to ask if he could update the readme to indicate this is still compatible with 3.5+ but I have not heard back.

Thank you very much for the explanation and your help Chris.