Redirected to install.php after changing table prefix

Hi!

I usually make it a routine to change my website’s(https://www.suriagroup.com.my) database table’s prefix using Website Defender feature once per week but after the last changes my website suddenly got redirected to the install.php! There were some errors shown after I changed the prefix but I was in a hurry I didnt bother to look at it properly.All I remembered was something like “taxonomy invalid” or something. I tried some of the solutions I found in the wordpress forum but still the problem persist. Here is what I have done:

1. I Check the wp-config.php. All seems fine, the username, password, even the prefix is the same with the table’s prefix.

2. Check the prefix in the database. Exactly the same with the settings in wp-config.php

3. Check the home and siteurl in the wp_option table. Made sure it directs to the website url.

4. Check and repair the table using PHPMyadmin.

5. Disable the custom .htaccess in wp-admin and wp-content folder by changing the extension name.

I have done all this but it still doesn’t fix the problem. Really appreciate if somebody can help out.Thanks in advance.