I uploaded all files. I changed .htaccess nad wp-config.php.
I exported in localhost/phpmyadmin my db, changed the above strings and imported it to the db of my websiteurl.
I did it many times with any problems.
Now I got an empty page after import. I tried exporting with all my plugins off and it works. I started enabling plugins one by one in my dashboard. Some of them cause the problem. I've got a blank page right after turning on a plugin. The parameters from url:
Some of them break all page (frontend and dashboard). Some of them leave frontend worked, but make whole dashboard down. And finally some of them break only wp-admin/plugin.php.
Plugins which I'm sure I can't activate:
Ultimate Tag Cloud Widget
I've been thinking a lot...
These plugins have some configuration in DB. I've been searching and I've found the script:
I've just used it but with no result.