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1. PHP REQUIREMENT LINK : https://docs.fusio-project.org/docs/installation/ and also check composer.json
2. Make manual installation using CLI because if we install from UI backend doesn't get installed.
   https://docs.fusio-project.org/docs/installation/#manual-setup
3. Also install backend using following command.
	php bin/fusio marketplace:install fusio    
4. We have disable fetching version number in import because it has multiple version specified. Enable it once vendor solves the issue. Propably in next update.
5. SET FUSIO_ENV="prod" and APP_DEBUG = "false" in '.env' file, before starting the manual installation.
6. Check and move public/apps/fusio/ from manual to zip(except index.html at public/apps/fusio/index.html , .htaccess at public/apps/fusio/.htaccess respectively) as it is created post execution of command 'php bin/fusio marketplace:install fusio' mentioned in the docs link above in point no. 2. Check the difference with /cache/app-fusio_{{random_string}}.zip. We can compare apps/fusio/ from https://github.com/apioo/fusio-apps-backend/releases/{{Latestversion}}.zip
7. Keep FUSIO_HOST as is i.e FUSIO_HOST="127.0.0.1" in manual installation.(Not required now)(As of Fusio 4.0.0 script uses APP_CONNECTION variable to set the db params)
8. Please note, always download 'fusio.zip' from latest version from https://github.com/apioo/fusio/releases as it pre-includes the vendor folder. Don't download the source code zips.