The most authoritative "article" on this topic is the official Serif support guide, Do you still support the Serif Plus range software?
Desktop Publishing (Predecessor to Affinity Publisher) PhotoPlus: Image Editing (Predecessor to Affinity Photo) serif legacy product keys
If you tell me the you're trying to activate, I can check for any unique workarounds or compatibility fixes for modern Windows versions. AI responses may include mistakes. Learn more The most authoritative "article" on this topic is
After installation, legacy products often prompt for a "Registration Code" (distinct from the initial Product Key). Since the online and phone registration servers are now offline, Serif has provided a Universal Registration Key to bypass this prompt: The Universal Code Affinity | Forum serif legacy product keys