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Office Libre (Free Office software)
Compatible with
Mac OS X (Aarch64/Apple Silicon) macOS x86_64 (10.12 or newer) Windows Windows x86_64 (Windows 7 or newer required)
Download here:
Free Operating system-Linux Operating Systems
Ubuntu Desktop
Ubuntu Desktop with free word, excel and PowerPoint replacement, and other useful application., You can install it in your old desk-top