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Ok tatane, if you don't actually read the messages and follow what is said we can not help you. The message I left spelled out exactly what you need to do. If you can not follow those directions then I am not sure there is much else we can do to help you with this.
You have composer installed.. As mentioned in a prior message you need to change to your xoops_lib directory while in a command line. If you do a directory listing you will see there is a composer.json file in that directory. This file is what is read to setup the installation.
Once you are in this directory you run the "composer install" command and you are done.
Attending College working towards Bachelors in Software Engineering and Network Security.