This download is completely secure. Opera Thomae is the developer of ККЦ RU which can be found in the Books & Reference category. The tool has the overall rating 4.7 on Google Play.
This application has been downloaded and installed by over 1K users and its most recent update was released on Sep 3, 2020. It's free to download the installation package of ККЦ RU, also, you can have a look at users' reviews on Droid Informer. The app works fine on Android 4.0 and higher.