Hey T.S.,
Honestly, it is very difficult for us to find out where goes wrong and what is the root cause without your backend and FTP access.
Here's what you can try:
1. Ensure that all the folders' permission are writeable except for the configuration.php as shown in the screenshot.
https://monosnap.com/file/XmdbwKxic0prjdY5aWlybxztPIkfa2
2. Create a new folder call 'komento' under your tmp folder so the path will be
JoomlaFolder/tmp/komento.
3. Then put this komento full installer zip file into this komento folder that you created in the tmp folder.
4. Extract the zip file in it.
5. Go to Joomla Install and select 'Install from Folder'(Rmb to modify the path to the komento folder) as shown in the screenshot for an example.
https://monosnap.com/file/mWXALE6YQU05eVaTaIPM7kfNsW0l3O
6. Press the 'check and install' button to try to install.
7. Let us know whether install success or not. If not, let us know what is the full error of it with a full screenshot.
P.s. Ensure that your backend is in English language so that we can have a better understanding of it. Also, ensure that your '
Debug System' is enabled and '
Error Reporting' is set to Max at your backend's Global configuration before you test it.
EDITED