Here are some potential reasons why apps on your phone won't install from the Google Play Store:

1. Outdated or corrupted Play Store app: This could be causing issues with downloading and installing apps.

2. Poor internet connection: Ensure that you're connected to a stable Wi-Fi network before trying again.

3. Storage space problems: Check if there's enough free storage on your device for new installations by going into Settings > Storage & then seeing how much available space is left under 'Internal' or 'External'. If necessary, consider deleting unused apps or files from internal/external SD cards depending upon where they're stored!

4. App permissions not enabled: Some apps require specific permission to work properly so make sure these are granted before attempting reinstallation.

5. Google Play Services issues: Sometimes the Google Play Store can't function correctly due to problems with its own services, try clearing cache and data or even uninstalling then reinstalling it entirely as a last resort:

a) Go into Settings > Apps & notifications (or Application Manager)

b) Look for 'Google Play Services'

c) Tap on three dots at top-right corner

d Eject all updates

e Restart phone

6. Malware infection: It's possible that your device has been infected with malware which could be interfering with app installations; perform a full scan using an antimalware program like Norton Antivirus Pro or Avast Free Antivirus to rule this out completely.

7. Corrupted data files: If none of above steps work, try clearing cache and data for individual apps that won't download:

a) Open Google Play Store

b Go into 'My Apps & notifications'

c Find problematic app(s)

d Long press on it/them until a menu appears at bottom right corner; tap 'Info'

e Scroll down to 'Clear Cache' then select 'OK'. Repeat this process for each affected application.

Google play store won't install apps