Hello, How to fix: either "offers", "review" or "aggregaterating" must be specified

There is many similar threads around this.
Enable structured data and if needed, modify it and add fake ratings (oc-includes/osclass/structured_data.php)

The structured data was enabled from the beginning, and can you give me an example of the fake ratings and under which line?

I'm just reading that I might make it worse with fake ratings.

It could, but there is no other way (thanks google).
Based on google "thinking", if you have product, it must be rated. Put there 3 of 5 or 4 of 5 and that's it.

Can you tell me the file and line?

There is many similar threads around this.
Enable structured data and if needed, modify it and add fake ratings (oc-includes/osclass/structured_data.php)

How do I solve this problem please? I faced it recently, but I did not find a way to correct it.
The field "item" is not included (in "itemListElement")

Add there attributes you miss.
Google has various docs those hows how it likes it.

Do you mean adding attributes plugin or what? Explain to me more please.
The HTML code I talked about is:
 <div class="bread-text"><ul class="breadcrumb" itemscope itemtype="http:// schema . org / BreadcrumbList"><meta itemprop="name" content="Breadcrumb"/>
<li itemscope itemprop="itemListElement" itemtype="http:// schema. org/ListItem" class="first-child" ><a href="...................................................

How it relates to "offers", "review" or "aggregaterating" ?
Create own thread with all details in it.