Is there a way to go back from production to testing with laravel 5.6

Some guy made a site with laravel 5.6 and we at a different place need to change just some tags and the CSS, I have a git of the site but vendor .env and many files are missing because it was already in production mode, how can I open the site in my computer to adjust the style sheets I have no database backup and also installed laravel 5.6 and try to paste de missing files but there are still many errors.

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