Path of Exile 2 standalone launcher fails to patch with OptiScaler v0.9.2–v0.9.4, while v0.9.0 works

[squall-cyber]

Game name and version:

Path of Exile 2, standalone client / standalone launcher, current live version.

Mods and mod versions used:

Tested OptiScaler v0.9.0-final, v0.9.2, v0.9.3, and v0.9.4-final.
No Fakenvapi, Nukem, ReShade, DLSS Enabler, or other game mods were used.

GPU:

AMD Radeon 8060S Graphics (RDNA 3.5 iGPU / Strix Halo).

OS:

Windows 11.

Used automated or manual install?

Manual installation.

If on AMD/Intel and Automated, used DLSS inputs?

Not applicable. I used manual installation and tested both DLSS and XeSS as in-game inputs with v0.9.0.

Did you check the Wiki and Compatibility List?

Yes. I checked the Path of Exile 2 page, Manual Installation, Known Issues, and the FSR4 Compatibility List.

Please describe the issue and steps to reproduce it:

Only OptiScaler v0.9.0-final allows the standalone Path of Exile 2 launcher to patch and launch normally.

With a clean game folder and after removing all previous OptiScaler files, simply copying the complete official OptiScaler v0.9.2, v0.9.3, or v0.9.4 release files into the PathOfExile_x64.exe folder causes the standalone launcher to fail before the game starts.

The launcher error is:

"Failed writing received data to disk/application (Failure writing output to destination)"

This happens during launcher patching/downloading, before the game executable starts and before any OptiScaler overlay can appear.

I tested each version separately:

• v0.9.0-final: launcher patches and game launches normally.
• v0.9.2: launcher patch fails with the error above.
• v0.9.3: launcher patch fails with the error above.
• v0.9.4-final: launcher patch fails with the error above.

For every test, I removed all OptiScaler-related files first and used the complete official release package. I did not mix files from different OptiScaler versions.

The game launcher works normally again after removing the OptiScaler files from v0.9.2/v0.9.3/v0.9.4.

With v0.9.0, I can open the OptiScaler overlay and select FSR 4.1.1, but the FSR watermark reports:
"FSR3 UPSCALE - SOURCE: DRIVER"
Therefore FSR4.1.1 appears to fall back to FSR3 on this RDNA 3.5 iGPU.

Could you please advise:

1. Which specific file(s) introduced in v0.9.2+ can cause the PoE2 standalone launcher patch/write failure?
2. Is there a supported installation method for Path of Exile 2 standalone launcher users with v0.9.4?
3. Is FSR4.1.1 INT8 expected to work on AMD Radeon 8060S / RDNA 3.5 iGPU in v0.9.4, and which INI settings are required?

I have attached:

• Screenshot of the standalone launcher error.
• Screenshot of the OptiScaler v0.9.0 overlay.
• Screenshot showing the FSR3 UPSCALE - SOURCE: DRIVER watermark.
• I can provide OptiScaler.log if needed.

[TheRazerMD]

You haven't attached anything btw, and yes, a log from 0.9 and 0.9.4 would be useful for comparison reasons (set LogLevel=0 and LogToFile=true in OptiScaler.ini).

Have you tried 0.9.1 also, just to nail down after which version this started?

As for your questions,

1. Between 0.9 and 0.9.2a outside of OptiScaler.dll itself, the updated files are fakenvapi.dll and the XeSS SDK
2. It works on the Steam version AFAIK, but don't have access to the game, will see if anyone on the server has more ideas
3. FSR 4.1.1 INT8 specifically requires 0.9.4 for proper support and setting Fsr4ForceEnableInt8=true in OptiScaler.ini (as per our release info). Outside of that, maybe the leaked FSR 4.0.2 would work, but IIRC the game is pretty aggressive about swapping files.

Edit: Maybe try using OptiScaler as d3d12.dll or some other supported filename to see if it works around this weird error.