Hi,
I had installed my version Joomla with DB. If I tried import your template, failed it. Could you please give me some advice how to install your template to my Joomla instalation?

So next step was to removed it and go with your instruciton.

But I have an issue. I went through step by step your instruction but something went wrong. When I open Home site there are some lines with errors, examples:
1. Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgSystemRegacymailing has a deprecated constructor in /www/doc/www.b21s.com/www/plugins/system/regacymailing/regacymailing.php on line 12
2. Warning: A non-numeric value encountered in /www/doc/www.b21s.com/www/templates/as002046/includes/includes.php on line 75
3. Warning: A non-numeric value encountered in /www/doc/www.b21s.com/www/modules/mod_as_menu/tmpl/styles.php on line 16
4. Warning: A non-numeric value encountered in /www/doc/www.b21s.com/www/modules/mod_as_menu/tmpl/styles.php on line 20

And second problem I can not get into backend. When I logged in show up this:
An error has occurred.
0 Failed to start the session because headers have already been sent by "/www/doc/www.b21s.com/www/plugins/system/regacymailing/regacymailing.php" at line 12.

Could you please help me. Thank you
Jakub