I just installed the latest Audacity v2.1.0 and the Punch Copy/Paste effect was no longer available. How do I add that function again on the new version?
“Punch Copy/Paste” was never shipped with Audacity. You can always check here http://wiki.audacityteam.org/wiki/Download_Nyquist_Plugins#shipped to see which Nyquist plugins are shipped with Audacity.
Steve’s “PunchCopy” and “PunchPaste” plugins are still “experimental” but if you wish to download them again, please obtain the “Current versions” from https://forum.audacityteam.org/t/punch-copy-paste/28906/1
Found the plug-in page, thanks!