iUserGuide: downloads, Mac shortcuts and how-to guides
How-to guides.
Step-by-step guides for your Apple devices. Quick visual walkthroughs with screenshots and short instructions to set things up and fix common problems.
Block internet access for Mac apps
Set up LuLu, block an outgoing connection, and manage your app permissions.
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Make macOS USB installer on Windows 11 [Catalina & others]
How to make macOS USB installer on a Windows PC
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Enable full screen contact photo or caller ID image for iPhone [iOS]
Enable full-screen caller ID photo on iPhone
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Convert macOS Installer .app to bootable .dmg or .iso image
This article explains a simple method to convert the macOS installer to bootable .DMG and ISO in a Mac.
Read more![This version of macOS [10.15.1 or 10.14.6] cannot be installed on this computer](/media/2026/10/26/optimized/7bf49b8d818edd-320.avif)
This version of macOS [10.15.5 or 10.14.6] cannot be installed on this computer
This version of macOS cannot be installed: Catalina (10.15) & Mojave (10.14)
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Play old PC games on Windows 10 (DOS, CD & 16-bit)
Ways to run and play old games on Windows 10 PC
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About Smartin
Apple Certified Support Professional
Smartin writes iUserGuide’s step-by-step guides for Mac, Windows and iPhone, covering software installation, troubleshooting and everyday tasks.