1. We have Given upgrade from version r180.
2. Use default dbprefix while manual installation. (Suggested by vendor)
3. Release date : https://www.projectsend.org/change-log/
4. PHP REQUIREMENT LINK: https://www.projectsend.org/how-to-install-projectsend/ and also check /vendor/composer/platform_check.php
5. Upgrade documentation: https://docs.projectsend.org/about/installation/upgrading