Steps to diagnose why application is not working.
1) Theme configuration: Make sure the filter app is installed properly on a specific theme. See instructions: https://imagelink.click/HtOrBm.png 
2) Check application Mode: Is application mode in live mode? If not then switch it to live mode. See instructions https://imagelink.click/uFCvBX.png
( Note: If you want to keep checking applications in test mode then add /preview as parameter after collection URL. See instructions https://imagelink.click/mhgVpD.png
If the filter application is still not working, let our team fix it for you. Please follow these instructions to create a staff account for us. Our technical team will respond to you ASAP. See instructions: https://support.digitalcoo.com/hc/en-us/articles/360052142492-Create-a-new-Staff-Account-