You can download the official PDF directly from PCI-SIG (the standards body), but note that membership is required for the latest versions (e.g., PCIe 6.0/7.0). However, public summaries and earlier revisions are available.
You can download the official PDF directly from PCI-SIG (the standards body), but note that membership is required for the latest versions (e.g., PCIe 6.0/7.0). However, public summaries and earlier revisions are available.