macOS Release Candidate Compatibility & Upgrade Readiness Workbench

Target Operating System

Apple Developer Release Candidate profiles (Reported by @9to5mac)

Pre-Flight Audit

Host Environment Simulation

Mac Hardware Model

Available Storage (APFS) 128 GB free

10 GB Req: 50 GB (Tahoe) 500 GB

APFS Time Machine Snapshot Clean rollback point prior to install

Developer Mode & SIP System Integrity Protection active

Installed Third-Party & Developer Tools

Check kernel extension deprecations and compatibility status

Application / Extension	Status	Diagnostic Notes	Actions

Load Preset:

Upgrade Telemetry

Automated Audit

85 Readiness / 100

Ready with Minor Cautions

Targeting macOS Tahoe 26.7.1 (Build 26G71) on MacBook Pro 16" (M3 Max, 2024).

Blocking Issues

1 Deprecated Kext

Advisory Warnings

1 Daemon update req

Pre-Flight Safety Checklist

Ready for verification & export

Release Candidate Advisory (9to5Mac)

Apple rolled out RCs for macOS Tahoe 26.7.1 and macOS Sequoia 15.8.1. Release Candidates represent near-final builds. Tahoe ends support for pre-2019 Intel Macs and mandates driverkit userland daemons over deprecated kernel extensions (.kext).

Release Candidate Matrix & Architectural Specifications

Reference: Apple Developer Seeds

macOS Tahoe 26.7.1 (26G71) Current Channel

Primary annual milestone update. Introduces updated Metal 4 shader toolchains and strict sandbox requirements for background helper services.

Minimum Free Disk: 50 GB
Supported Hardware: Apple Silicon (M1-M4) & select 2019+ Intel
Legacy KEXTs: Blocked without specialized boot security toggle

macOS Sequoia 15.8.1 (22F81) Maintenance Channel

Stability and security patch release for deployed Sequoia fleets. Ideal for enterprise environments with strict legacy dependencies.