1. The installer is at /install/install.php
2. Rename config.default to config in our package.(we handle this from install.php)
3. For major upgrades please change upgrade.php to import sql according to version
4. Upgrade is Disabled from version lower than 14.0.0 because password utility is changed. No utility to change password after upgrade. (User need to hash their password and make entry in DB. Confirm with vendor). Enable upgrade from 14.0.0 as user will not required to change password. Also, add upgrade file in upgrade folder if required and make changes in upgrade.php. 
5. PHP REQUIREMENT LINK: https://tcexam.org/docs/installation/
6. Since 17.x.x As mentioned in the installation docs after extracting the downloaded zip you need to download the dependencies using composer.
https://github.com/tecnickcom/tcexam/blob/main/install/README.md Without this tcexam will not work.
7. Enable auto upgrade again in the next version. (17.x.x to 17.x.y)
8. K_KEY_SECURITY is same as its gets generated while downloading package through composer.
9. Keep utf8 changes in /admin/config/tce_config.php file because the script has not handled it.
10. If manual installation is done on a http server set 'K_COOKIE_SECURE' as false in /shared/config/tce_config.php , i.e  define('K_COOKIE_SECURE', false);, else login won't work, by default it's true. Referred from K_COOKIE_SECURE under official docs : 
https://tcexam.org/docs/srcdoc/tcexam/files-shared-config-default-tce-config/