Customer account block option is not available on my theme

Here are the steps to manually install for Shopify old themes:

Step 1: Copy the code below

<!-- blocks/my-account-block start -->
<div id="aio-my-account-app"
     data-customer-id="{{ customer.id }}"
     data-shop-url="{{ shop.permanent_domain }}" data-shop-name="{{ shop.name }}" style="min-height:400px;display:none" class="aio-block-width"></div>
 <script>
    const datetime = new Date().toISOString();
    const script = document.createElement('script');
    script.src = `https://static.aitrillion.com/aio-script/aio-my-account.js?v=${datetime}`;
    script.defer = true;
    document.head.appendChild(script);
</script>
<style>

.aio-block-width{
  width:100%;
  text-align:center;
}
.aio-block-width .aio-app-container {
  text-align:left;
  width:1200px;
  max-width:100%;
  margin-left:auto;
  margin-right:auto;
  padding-left:15px;
  padding-right:15px;
  padding-top:15px;
  padding-bottom:15px;
  display:inline-block;
} 
</style>        
  <!-- blocks/my-account-block end -->

Step 2: Go to Shopify Admin > Online Store > Themes > Actions (Published theme) > Edit Code

Step 3: Find customers/account.liquid template

Step 4: Comment all the code of this file and paste the copied code

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