Hi,
is there any way to select top category to have displayed products from all categories?

Use category=0 to show all products

How to do this?

you should use version 3.4.2 virtuemart. mod for virtuemart not support for version 3.6.2.

Hmm,
I remember you help me to upgrade all components from SJ BeeStore to 3.6 version and said it can works with VirtueMart 3.8.4, so I have now VirtueMart 3.8.4 and it works.
But I can't set category=0 or leave it empty od set to "0".

Hello,
All above modules has is a file in path : core\fields\sjvmcategories.php
So you need to simply change (near line 46 ):
VmConfig::loadConfig();

if (!class_exists('VmModel')) {
if (defined('JPATH_VM_ADMINISTRATOR') && file_exists(JPATH_VM_ADMINISTRATOR . '/helpers/vmmodel.php')) {
require JPATH_VM_ADMINISTRATOR . '/helpers/vmmodel.php';
} else {
$this->error = 'Could not find VmModel helper';
return false;
}
}
and find
protected function getCategories()
comment code
//VmConfig::loadJLang('com_virtuemart', true);
VmConfig::loadConfig();

Thanks