customizer doesn’t work

Can you provide the screenshot of what you see when you access the customizer option? This would help analyzing if something is missing.

Where can I upload the screenshot?

you can upload on a free image hosting site like imgur.com and share the link here or maybe upload on your google drive/dropbox and share the link.

View post on imgur.com

First, deactivate all the plugins one-by-one while checking if the problem still persists.

Second, change the default theme to other WordPress theme and check if the customizer works in that theme. Then change back to the theme you want and check again.

PS: Before anything, if the website has any data, take a backup first.

I have delete all the plugins, but the problem stays the same.
I tried another theme, but here the same problem exists.

Can you set WP_DEBUG to TRUE in wp-config.php and then check if any Warnings or Error pops up while using the customizer?

No warnings or pop up when EP_DEBUG is TRUE

Update your WordPress.

I downloaded it today from www.ads-software.com

Any plugin?

no plugins

I want you too delete everything from server and install WordPress back again ??

Alright. I will do that. Thanks.

Let me know the result ??