You can find official downloads and support for the different tiers (32x to 512x) on the creator's Patrix Texture Pack page or their Patreon for higher-resolution versions. OGZCraft Resource Pack 1.16 / 1.15 | Texture Packs
Follow these instructions exactly. The process is simple, but mistakes are common. File name- Patrix-Resource-Pack-256x-1.16.5.zip