Problems with the plugin description

Dear list,

I consulted the description posted in vim/runtime/doc/repeat.txt on github very carefully.  I wanted to install the calendar-vim script which was originally designed (last version) for vim7.2.  I now use vim 9.0. 

I created a directory ~/.vim/pack/calendar/start and unpacked calendar-vim.zip there which creates the usual autoload/ doc/ and plugin/ directories there. 

It was said, that vim searches for the plugins in the start-directory after looking in the .vimrc. 

It should load automatically.  But nothing happens. 

Is there any kind of stupid mistake of mine?

Thanks a lot!

Best regards!

Heiko Schroeder, Ahrensburg, Germany