Problem installing hot_hotel25.zip

Does anybody know how to resolve this?

I have installed different templates on Joola 2.5

But for the Hotel template, when I use the extension manager tool, it is mentionned: Installation d'un template : il y a déjà un template qui utilise le répertoire nommé Installer. Essayez-vous d'installer à nouveau le même template ?

I deleted all the other template and it still mentions this.

What does that mean in English? Of swap to English and copy paste message in English

Please find the translation into english

Template Install: There is already a Template using the named directory: Install. Are you trying to install the same template again?

First see if you truly maybe have template already installed , template manager list has pagination so some people miss to notice template listed on second page. If that is not case maybe you have left-over folder for failed installation attempt or you previously had template and did not correctly uninstalled. In taht cas you can just delete template folder from /templates .
BUT BE SURE TO CHECK WHAT I WROTE TO YOU , IF YOU JUST DELETE FOLDER AND TEMPLATE IS INFACT INSTALLED IN JOOMLA YOU CAN CREATE SEROUS DAMAGE.