Error 404 is caused by missing of the required .htaccess file. Please follow the steps below to fix
Method 1
Open the package file downloaded from codecanyon, open the upload folder and there you have the .htaccess file, re-upload this file into your installation root folder and the issue is fixed
Method 2
In your installation root folder, create a new file named ".htaccess" (includes the dot), copy and paste the code below, then save
Options -MultiViews -Indexes
RewriteEngine On
# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [L,R=301]
# Handle Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]