This must be opened on an iOS device that has TrollStore installed with "URL Scheme Enable" is ON in TrollStore settings.
Here is a guide on how to install it on your device TrollStore Guide

If you are not redirected within 3 seconds, click here to manually open.

You can also manually enter this url in TrollStore->'Install from URL' -- https://hacx.org/repo/CallRecorderXPlus-3.33.tipa