But in a second test server, I can’t. If try install core.zip, I receive a error message “plug-in already exists”
When manually installing a new version of a plugin you need to de-activate and delete the original version of the plugin first, it looks like your trying to install the plugin with the old version still installed.
We have instructions for manually install EE here:
The support post ‘How to upgrade EE release in development servers’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.