I've tried to install the app but couldn't get it to work. However, I contacted the support and asked them if they would install the app for me - which they were only too happy to do. Result...a brilliant reordering system is now fully functional in my customers' account area.
UPDATE: A WEEK LATER THIS APP CAUSED MAJOR ISSUES WITH MY NAVIGATION MENU, STOPPED IT WORKING AND ISSUES WITH SCROLLING UP AND DOWN MY SITE TOO! SO ADVISED BY SHOPIFY TO DELETE! DONE.
FURTHER UPDATE. I'll get back in touch with the app developers in a couple of days and see if we can reinstall - see how it goes as I really did like the app (it was my favourite actually).
We are extremely sorry for the inconvenience you had with our app.
We had contacted you regarding the issue you were faced with this app, but we didn't get any response from your end. We also have experienced that you have removed our app from your website. We are requesting you to please give us a chance to correct our mistakes and make this app run again on your website as it was running before.