Theme won't change

#1
Im new the wordpress, started a week ago.
I want to change the the theme of my website to blocksy but when i click to install and activate the wp_admin page says it's activated but when i go to my actual website it won't change and I dont know why.
I tried clearing cache on browser and on wordpress with plugin and nothing seem to work. It’s just the default twenty twenty theme. Tried updating php version, logging out relogging , open website as incognito, tried reset with wp reset, tried going to setting -> reading and change to static page and home page, Went to FTP in cpanel and included permission for index.php and style.css in blocksy theme but nothing works. Any ideas?

Hosting: hostinger
 
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