vue js button disable and enable - vue.js

Question

when page is landing default next button is disabled, we will selected one radio button
next button is disabled.
condition based on work with disable and enable next button
{% if cust_package == '6 Free Trades' %}
Subscribe for more Trades options will be enabled once you consume all 6 free trades
{% comment %} {% elif cust_package == " " %}
{% endcomment %}
{% elif cust_package == "" %}
Subscribe for more Trades options will be enabled once you consume all 6 free trades
{% endif %}
<hr style="position: relative;top: -4px;border-color: lightgray;">
<p class="head-trades" style="top: -11px;"> Subscribe for more Trades:</p>
{% if cust_package and package_value != 0%}
<p class="sixfreetrade">
<input style="position: relative;width: 4%;left: 1px;"
type="radio" id="business"
name="flag" value="15 Trades for $6.99" v-model="subscribe" disabled>
<span style="" class="Business_postadTrade">15 Trades for $6.99 </span>
</p>
<div v-if="subscribe == '15 Trades for $6.99'">
{% if cust_package %}
{% if cust_package == '15 Trades for $6.99' %}
{% if package_value == 0 and cust_package == '15 Trades for $6.99' %}
<p style = "color: #DB0038;">* You consumed {{consumed_ads}} Trades and left with {{package_value}} Trade * Please upgrade higher subscription if you want more Trades to post</p>
{% elif package_value != 0 and cust_package == '15 Trades for $6.99' %}
<p>* You consumed {{consumed_ads}} trades and left with {{package_value}} trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% else %}
<p>* You consumed 0 trades and left with 15 trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% endif %}
</div>
<p class="sixfreetrade">
<input style="position: relative;width: 4%;left: 1px;"
type="radio" id="business"
name="flag" value="30 Trades for $12.99" v-model="subscribe" disabled>
<span style="" class="Business_postadTrade">30 Trades for $12.99 </span>
</p>
<div v-if="subscribe == '30 Trades for $12.99'">
{% if cust_package %}
{% if cust_package == '30 Trades for $12.99' %}
{% if package_value == 0 and cust_package == '30 Trades for $12.99' %}
<p style="color: #DB0038;">* You consumed {{consumed_ads}} Trades and left with {{package_value}} Trade * Please upgrade higher subscription if you want more Trades to post</p>
{% elif package_value != 0 and cust_package == '30 Trades for $12.99' %}
<p>* You consumed {{consumed_ads}} trades and left with {{package_value}} trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% else %}
<p>* You consumed 0 trades and left with 30 trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% endif %}
</div>
<p class="sixfreetrade">
<input style="position: relative;width: 4%;left: 1px;"
type="radio" id="business"
name="flag" value="120 Trades for $24.99" v-model="subscribe" disabled>
<span style="" class="Business_postadTrade">120 Trades for $24.99 </span>
</p>
<div v-if="subscribe == '120 Trades for $24.99'">
{% if cust_package %}
{% if cust_package == '120 Trades for $24.99' %}
{% if package_value == 0 and cust_package == '120 Trades for $24.99' %}
<p style="color: #DB0038;">* You consumed {{consumed_ads}} Trades and left with {{package_value}} Trade * Please upgrade higher subscription if you want more Trades to post</p>
{% elif package_value != 0 and cust_package == '120 Trades for $24.99' %}
<p>* You consumed {{consumed_ads}} trades and left with {{package_value}} trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% else %}
<p>* You consumed 0 trades and left with 120 trades.</p>
{% comment %} <p>* Want more ads in this month, please upgrade higher package</p> {% endcomment %}
{% endif %}
{% endif %}
</div>
default next button is disable and click on radio button next button is enable