How to install stock keyboard on android7?

Question

Mobile devices

The regular keyboard "Gboard - Google Keyboard" on the phone disappeared. Tried to install via Google Play. Google Play after the inscription "Installing ..." displays a window:
Failed to install
the application "Gboard - Go ...
Try again. If this
does not help, use
the troubleshooting
tips
I follow the link to Google. This link contains the steps:
Step 1. Connect to a Wi-Fi or mobile network with a good signal
Step 2. Clear cache and delete Play Store data
Step 3. Restart your device
After these actions, no changes occur. I tried to install other applications (keyboard) on the phone, these applications are installed without any error. After I decided to install "Gboard - Google Keyboard" through the Google browser. I install. I go to Downloads on the phone, install the application, a message is displayed that it is already installed. When you exit to the main application menu, the icon is not shown, which means that it is not installed. How to solve this problem?