Why Choose Keith Thomas
• 20 years of experience as a Senior Apple Support Specialist at Apple Computer UK HQ.
• Former Apple Computer UK Mac Support Specialist and Apple Authorised Service Provider background.
• Established and Independent since 2010 for on‑site Apple Support Service – no call centres, no outsourcing, no hardware repairs. Over 25,000+ Apple problems resolved. Unique on-site Apple Support Service. backed up with Independent Apple Telephone Support Assistance.
• Trusted by home users, small businesses, and professionals across London and the South East UK.• Clear, honest, software‑only support. No Hardware Repairs. Expert Apple Consultancy Service.
On‑site Apple Mac Support in London and the South East UK
What this page covers
This guide explains the real reasons Mac apps won’t install, the steps you can try yourself, and when it’s time to get professional on‑site help. It applies to:
• MacBook Air
• MacBook Pro
• iMac
• Mac mini
• Mac Studio
If apps get stuck on “Installing…”, fail with an error, or won’t install from the App Store or a downloaded installer, this page is for you.
The most common reasons Mac apps won’t install
These are the issues that Keith Thomas identifies most often during on‑site visits:
• App Store connection issues
• Apple ID or iCloud conflicts
• Damaged installer files
• Insufficient disk space
• macOS update issues
• Security & Privacy restrictions
• Developer not verified
• App not supported on your macOS version
Quick checks you can do yourself
These steps solve around 60% of installation issues.
Check 1 – Restart the Mac
A restart clears temporary installation and App Store processes.
Check 2 – Restart the App Store
Quit the App Store completely and reopen it.
Check 3 – Sign out and back into the App Store
App Store → Store → Sign Out → Sign In.
Check 4 – Check free disk space
Go to Apple menu → About This Mac → Storage. Aim for at least 20GB free.
If App Store apps won’t install
This usually means:
• Apple ID issues
• App Store cache corruption
• Network or Wi‑Fi problems
Try:
• Restarting the Mac
• Signing out and back into the App Store
• Restarting your router
If downloaded apps won’t install
This usually means:
• Damaged installer
• Developer not verified
• Security settings blocking installation
Try:
• Downloading the installer again
• Going to System Settings → Privacy & Security → Allow Anyway
• Restarting the Mac
If apps won’t install after a macOS update
This usually means:
• App incompatibility
• iCloud syncing delays
• macOS update conflicts
Try:
• Restarting the Mac
• Updating the app manually
• Reinstalling the app
If only some apps won’t install
This usually means:
• App no longer supported
• Developer removed the installer
• App Store account mismatch
Try:
• Checking if the app is still supported on your macOS version
• Reinstalling the app
• Restarting the Mac
When DIY stops working
You should get on‑site help if:
• Apps refuse to install repeatedly
• App Store errors keep appearing
• macOS reinstall does not fix the issue
• Installers fail across multiple apps
• You need your data preserved
These issues usually require:
• App Store and system configuration repair
• macOS recovery
• Data‑safe macOS reinstall
• User account repair
• Permissions and system file diagnostics
On‑Site Apple Mac Support – London & South East UK
If your Mac apps are not installing, Keith Thomas provides an often same‑day on‑site support service across:
• Central London
• West, North, South and East London
• Surrey
• Berkshire
• Hampshire
• Wiltshire
Keith Thomas is a Mac Support Specialist in:
• App installation and App Store issues
• macOS configuration repair
• Data‑safe macOS recovery
• macOS reinstall and repair
• iCloud and Apple Account issues
• New Mac setup and migration
• User account and permissions diagnostics
Book on‑site help in London and the South East UK
If your Mac apps are not installing, Keith Thomas can visit your home or office and get you working again.
Keith Thomas – Apple Mac Support Specialist
Established 2010 – Open 09:30–20:30, 7 Days
Contact Keith Thomas by Telephone: 07800 940756 or by Text to: 07800 940756, or simply complete an online website contact form 24/7