Step1: Download the latest .tar file form the link https://github.com/invoiceninja/invoiceninja/releases
Step2: Create New folder and past the download file
Step3: Unzip using the command tar -xf invoiceninja.tar
Step4: Update the permission of Folder unziped (Invoiceninja) to www
Step5: Run command composer install
Step6: Run command composer update
Step7: Create Database in Mysql
Step8: Rename the .env example to .env and update the database details.
Step9: Run the command php artisan migrate

Step1: Before upgrade take the backup of Database, .env and public/storage
Step2: Download the latest .tar file form the link https://github.com/invoiceninja/invoiceninja/releases
Step3: Create New folder and past the download file
Step4: Unzip using the command tar -xf invoiceninja.tar
Step5: Update the permission of Folder unziped (Invoiceninja) to www
Step6: Run command composer install
Step7: Run command composer update
Step8: Run the command php artisan migrate
Step9: Past the .env and public/storage in new installed location.