What happens?
When accessing the plugins window the Activate button is disabled.
What to do?
IMPORTANT: this procedure should not be performed if the plugin in question is a system plugin. System plugins do not need to be activated.
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Close Promob and go to Local Disk (C:)\Users\logged_user_name\AppData\Local\Temp. NOTE: The AppData folder is a hidden folder, if not showing, click here;
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Find and delete files with the .pa extension (example: filename.pa);
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Open Promob and activate the plugin.