On a joomla 3.8.7 with some old modules (see the screenshot please) I can't intall mod_booklibrary_books_os_touchslider_2018_04_02.zip
I get the error:
Extension Install: Another Module is already using the named folder: /home/parcopalhh/parc-opale-2016/modules/mod_booklibrary_os_touchslider. Are you trying to install the same extension again?
Error installing module
I add that we already have contents and modules set up for years so I just can't uninstall older modules
What should I do please ?