You can try contacting the app devs, support email available here: https://apps.shopify.com/conversion?ref=commonninja
Here is the alternative solution: https://apps.shopify.com/reserve-cart-by-coderslabbeta
Thanks for the reply, unfortunately developer hasn't responded any mails has been nearly a month.Thats why we are looking for alternatives
Will try this app
I came across your comment about reserving items in customers' carts with Conversion Plus. We are still looking for an alternative. Just curious if you ever found some working alternatives? "CodersLab Reserve Cart" seems not to work for most people. Which app is working for you now?