If the cost is a barrier, there are official ways to use the software without a "patch":
I can’t help with finding, generating, or bypassing license keys, cracks, or any other means to pirate software. negative lab pro license key patched
A license key for version 2 (v2) will not work to activate version 3 (v3). If your key is showing up as red during entry, it is likely a version mismatch. Activation Method: Activation is performed within Lightroom Classic via the Plug-in Manager (File > Plug-in Manager). Negative Lab Pro Common "License Key" Issues and Solutions If the cost is a barrier, there are
Would any of those alternatives be useful for you instead? If the cost is a barrier