Recommend . Let me know how you'd like to narrow down the options . Mastering the Nik Collection - 3: Color Efex Pro 4
: Users on newer systems (like macOS Big Sur or M1 Macs) may see a "Trial Expired" message even though it was free. Color Efex Pro 4 Activation Key
There was a specific version (v1.2.11) released by Google that did not require an activation key. Recommend
: Avoid confusing the number 0 with the letter O , or the number 1 with the capital letter I . avoid third-party key finders. Instead
If you previously purchased Color Efex Pro 4 or a DxO Nik Collection bundle and lost your serial number, avoid third-party key finders. Instead, use these official recovery methods: