try to turn off Play Protect sa Play Store ma'am. Right Upper Side in your main screen pag nakapasok kana sa play store. Click your profile account and then hanapin mo yung " Play Protect ". Pagkatapos click the " icon settings " in upper right side ,then turn off everything. Pag di parin gumana. Go to your phone settings ,then hanapin mo yung App Management or something mag kakaiba kase yan depende sa device. And pag nahanap mo ,hanapin mo naman yung " Install Unknowned Apps " na section then pag nakapasok kana ,hanapin mo yung Chrome and just turn on all the permission or Allow to install unknown apps. Sana makatulong