<div class="form-group col-md-12">
    <label for="old_hl_number">
        Client's existing ARCHLine.XP <?= $product->seq == 1 ? 'LT license' : 'Non-Profit' ?> serial number (16 digits) *
    </label>
    <input type="text" name="old_hl_number" class="form-control" id="old_hl_number" required>
    <div id="old_hl_number-error"></div>
    <div id="wrong_hl_num-error"></div>
</div>