Here are the steps to manually installation 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 src="https://static.aitrillion.com/aio-script/aio-my-account.js" defer></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
