Profile: Support

Open the store list in the nopcommerce admin mode.
Check your store URL.
It has to have  a forward slash '/'  at this end of the string.
Example
https://www.yourstore.com/

Please check it and write me about result.

Check the name of model for product details page and check the names of the action and the controller.

I upgraded all plugins.

Clear the cache of the browser and download the new ZIP file.
I download the old 3.1.0 DLL Microsoft files and recompiled plugin.
Please try again.

Download the new release.
I recompiled the plugin with less DLL versions.
Try and write me about result.

An you want to create array for product order items.
Am I right?

'transactionProducts': [{
       'sku': '%ProductIds%',
       'name': '',
       'category': %PageType%,
       'price': %ProductPrice%,
       'quantity': %Quantity%
   }]

I can't understand you. Plugin adds all products (not one!) from the order in this DataLayer object. See example.

<script>
window.dataLayer = window.dataLayer || [];
dataLayer.push({
   'transactionId': '1234',
   'transactionAffiliation': 'Acme Clothing',
   'transactionTotal': 38.26,
   'transactionTax': 1.29,
   'transactionShipping': 5,
   'transactionProducts': [{
       'sku': 'DD44',
       'name': 'T-Shirt',
       'category': 'Apparel',
       'price': 11.99,
       'quantity': 1
   },{
       'sku': 'AA1243544',
       'name': 'Hat',
       'category': 'Apparel',
       'price': 9.99,
       'quantity': 2
   }]
});
</script>

Can you try trial version and check the datalayer?

Thank you

You are right.
I did a new release, Download it and try it.