AVX2 support began with Excavator and Ryzen processors.
Before the official patch, users used the Intel Software Development Emulator (SDE) to bypass the check. This method is highly inefficient and often results in unplayable frame rates (around 10–20 FPS) because your CPU has to emulate complex instructions it wasn't built for.
AVX2 was introduced with the Haswell (4th Gen) architecture. If your CPU is older (e.g., i7-2600K, i7-3770K), you lack AVX2. uncharted+4+avx2+fix+free
For many PC gamers with older hardware, launching (part of the Legacy of Thieves Collection ) was met with a frustrating "unsupported CPU" error. This was due to the game's initial requirement for AVX2 (Advanced Vector Extensions 2) , a processor instruction set that many older—yet still capable—CPUs like the Intel Sandy Bridge (i7-2600K) or Ivy Bridge (i7-3770K) do not possess.
Since the official 1.3 update, these manual workarounds are obsolete for most users. How to Check if Your CPU Supports AVX2 AVX2 support began with Excavator and Ryzen processors
The patch adds support for older CPUs by detecting the lack of AVX2 and automatically switching to a fallback executable ( u4-l.exe for Uncharted 4 or tll-l.exe for Lost Legacy).
Even with the AVX2 restriction removed, Uncharted 4 is a demanding title. Ensure your PC meets the rest of the to avoid severe lag: AVX2 was introduced with the Haswell (4th Gen) architecture
If you are still having trouble launching the game, verify your hardware capabilities:
The most important news for players is that on November 16, 2022, specifically to address this issue.