Problem with popclip 2019.9 on high sierra

When I try to install an extension I get the following message

The path /var/folders/cc/3vcync0j7n7268j23slgb2dc0000gn/T/TemporaryItems/(Un documento siendo guardado por PopClip)/Append.popclipext does not contain a valid PopClip extension.

Reason: Could not load Config.plist. The XML may be malformed.

what can i do?

That version of PopClip is more than four years old and can’t load the latest extensions. I suggest updating to PopClip 2023.7, which is the last version supporting High Sierra. Update from the Mac App Store or download from Download PopClip

it works well. Thanks