1. PHP REQUIREMENT LINK : https://docs.instantcms.ru/en/manual/install#php-check and https://github.com/instantsoft/icms2#requirements. Check required php extensions from install/steps/php.php under $extensions array from function check_requirements()
2. Download the package from website. https://instantcms.io/
3. Install without demo data.
4. Take dumps when the installation get completed. (On Finish Page)
5. Configure Session save path as [[softpath]]/tmp(Create 'tmp' folder under [[softpath]] folder and give permission, while manual install)
6. Timezone is hardcoded under /install/languages/en/language.php under LANG_CFG_TIME_ZONE i.e Europe/London, so keep as is.
7. Database collation keep UTF8mb4 and Database engine keep InnoDB in manual installation.
8. Make manual installation on server with MYSQL 5.7, as some features like fulltext search won't work with older versions.
9. Copy /upload/000/* folder and it's contents from manual to zip, as it's not made via Softaculous. Contents can be checked with /install/upload/modern/000/*, they are the same.