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Version 2.5.2 was successfully installed and activated on Windows 10 64-bit edition and - as shown in the image -
Download Serif Affinity Photo 2.6.2.3228 x64 Multilingual
Download Affinity Photo 2.6.2 macOS Multilingual
Download Serif Affinity Photo 1.8.3.641 x64 Multilingual Portable
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Windows version: 681 MB
Portable version: 454 MB
Mac version: 740 MB