Hello
After updating the component has changed my view category
Not see the bottom of the cube product
before update:
tiltan-flowers.co.il/index.php/module-positions

after update
new.tiltan-flowers.co.il/index.php/module-positions

How to fix it look like before the update?

Hi. You need to ask your template provider or the site developer for this. Probably the developer had applied some changes in core K2 files and now they are lost after the update. Making changes in core files is a bad idea. That's why templates and overrides are there.

At least tell me what files I have to edit to fix it?

I cannot know exactly. It depends on the category settings and if it is using a custom template. The default core K2 layout files are located at /components/com_k2/templates/default .

Why I do not see the extra fields in category view?
new.tiltan-flowers.co.il/index.php/he/module-positions

This new.tiltan-flowers.co.il/index.php/he/module-positions is not K2 category view. You are using a module there to display items. This module is not even part of K2. If you want to use the K2 category view you need to make a menu link to a K2 category. If you want to use a module you can use the K2 content module. If you want to keep using the current module you are using there you have to ask it's developer why extra fields are not displayed.