Need help to make this work on my new device which has newer 64bit chipset

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I have been using this application on all of my cellphones, the last one i was using had some hardware faults that i had to buy a new one, my device's specs are as follow, Android 5.0, Mt6735 CPU Armv8. Everytime i try to open an app that require open cv it just throw an error saying "Opencv package was not found, try to reinstall it?" I have tried to reistall it a hundred of times but to no available, please help me as my very important application requires Opecv to be installed :'(