404 Page Not Found
The page you requested was not found.
unable to install in a directory on a server
Probably some apache configuration that’s not right.
[quote=“Laurens, post:2, topic:1323”]
bly some apache configuration that’s not right.
[/quote]checked the configurations
all requirements are satisfied
still getting this error
I mean on your server, do you have virtual hosts configured? Did you change something in .htaccess? Does it work when NOT in a subdirectory? All important questions. Please provide us with a little more info than “it doesn’t work”.
A 404 error simply means your webserver cannot find your website location that you set up, so it shows an error instead. So you’ll have to look in that direction. Also be sure to have your file permissions and ownership correct.
Thanks. 
If you’re installing to a subdirectory doublecheck your RewriteBase in the .htaccess file.
i have checked
Remove index.php
RewriteEngine on
RewriteBase / aa
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . index.php [L]
If your subfolder is called aa your entry should look like
RewriteBase /aa/
Did you allowed .htaccess modifications?
AllowOverride needs to be set to all in your Apache configuration.
Internal Server Error
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More information about this error may be available in the server error log.
ON adding
Options Indexes FollowSymLinks AllowOverride All Require all granted