It is not possible to install Guitar Pro 7 on your smartphone or tablet, these one can only install iOS or Android applications that have been developed for iOS and Android.
We did develop the Guitar Pro Mobile application which is a totally different application. Your Guitar Pro 7 desktop license do not allow you to receive the Guitar Pro Mobile application for free.
These are two different and complementary products that have to be purchased from two different platforms. The Guitar Pro Mobile application can only be purchased from either the Apple AppStore or the GooglePlay Store.
You will find more information about the Guitar Pro Mobile application from this page.