1. Download full package and upgrade package from sourceforge i.e http://e107.org/get-started
2. Upgrade is allowed for all 1.x to 2.1. Check the files and folders that needs to be deleted in next version. This can be checked while logging into admin after upgrade.
3. kindly check and add upgrade method when there is update in 2.x branch. (Current upgrade method support only 1.x to 2.x)
4. PHP REQUIREMENT LINK : https://github.com/e107inc/e107#requirements OR http://e107.org/get-started
5. Since e107 2.3.0 version list of files to be deleted can be checked from /e107_system/{{RAND_FOLDER_NAME}}/logs/fileinspector/deprecatedFiles.log. Since post upgrade the script does not ask to delete any folders, we have commented the code to delete folders in upgrade.php. Check this in every version.
6. Important : If warning is thrown that Your site url does not include a web address then Configure siteurl value in `[[dbprefix]]core` table under 'SitePrefs' and 'SitePrefs_Backup' rows(array) both for value for 'siteurl' name as '[[softurl]]/, Please set it to full address visitors use, as script by default sets it to [[relativeurl]]
https://github.com/e107inc/e107/issues/6806 . To check these changes in db we set Admin -> Preferences -> Site Information -> SiteURL (as absolute URL), take sql dump and compare it with the default manual installation sql. (Since 2.3.13)