Hi,
I have problem with installation: limesurvey2.64.6+170332
I can't find config.php file...

How about running a search for 'config.php'? Then you would find it probably here: /application/config/ ...

But there is config-defaults.php is it the same?
When I start instalation of LS (....limesurvey/admin) on web server there is:

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Warning: require_once(application/Psr4AutoloaderClass.php): failed to open stream: No such file or directory in /home/mirena1/ftp/ci/index.php on line 183

Fatal error: require_once(): Failed opening required 'application/Psr4AutoloaderClass.php' (include_path='.:/usr/share/php:/usr/share/pear') in /home/mirena1/ftp/ci/index.php on line 183

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Last time (few months ago) I was installing LS without any problems

config-defaults.php is the base configuration, the defaults that LS will fall back to if they are NOT configured in config.php. Never change anything in config-defaults.php, but rather in config.php. If there is a configuration that you would like to change and it is not yet in config.php, copy it from config-defaults into config and change it there.

Where should config.php be located? In /application/config/?
i.e. Where should I copy the file...?