Thank you for your advice,
I downloaded dokuwiki_plugin_wrap-stable.zip from https://www.dokuwiki.org/plugin:wrap
I placed it on the local drive of my working PC. I did not unzip it. If in the extension manager / manual installation tab I specify the path to this archive on the local machine, then I get the message "Failed to determine the directory for addition, download and installation must be done manually."
I myself will unzip the archive and copy all its contents to the address /share/CACHEDEV1_DATA/.qpkg/QDokuWiki/dokuwiki/lib/plugins/wrap. Then I get an extension manager message that the archive needs to be reinstalled. Attempting to reinstall the plugin again leads to the message https://github.com/selfthinker/dokuwiki_plugin_wrap/archive/stable.zip
On the version of DokuWiki v20130510.2 (2019/07/02), the manual installation was successful.
I'd like to understand how you can install this plugin (however, others too)
Thank you in advance