Bug: Can't install OptiScaler Mod

[brunomueller93]

Heya!

Maybe I'm doing something wrong but I just can't install this plugin properly.

Similarly to the lsfg-vk plugin, I've downloaded the 0.30 release .zip and used Decky to install the decky-optiscaler plugin. This works.

Now I open the Decky Optiscaler plugin and press the "Install OptiScaler" button. It will load for a while and it will display a success message for a few seconds. However, the red warning message on the top "OptiScaler Mod Not Installed" will still be visible and will not disappear. The script will create an empty folder ~/opti but yeah, there's nothing inside of it.

Trying this on a Steam Deck with the latest Stable version.

The logs contain the following messages over and over again:

[2025-09-28 22:20:45,482][INFO]: Framegen plugin loaded
[2025-09-28 22:21:16,095][WARNING]: OptiScaler directory exists but missing files: ['OptiScaler.dll', 'dlssg_to_fsr3_amd_is_better.dll', 'fakenvapi.ini', 'nvapi64.dll', 'amd_fidelityfx_dx12.dll', 'amd_fidelityfx_vk.dll', 'libxess.dll', 'opti.sh', 'opti-uninstaller.sh', 'uninstall-nuclear.sh']
[2025-09-28 22:21:17,319][INFO]: Starting OptiScaler bleeding-edge installation
[2025-09-28 22:21:17,319][INFO]: Starting OptiScaler bleeding-edge release download
[2025-09-28 22:21:17,320][INFO]: Fetching release info from https://api.github.com/repos/xXJSONDeruloXx/OptiScaler-Bleeding-Edge/releases/latest
[2025-09-28 22:21:17,688][INFO]: Detected version: Optiscaler_0.9.0-pre3.20250911
[2025-09-28 22:21:17,688][INFO]: Downloading Optiscaler_0.9.0-pre3.20250911.7z to /home/deck/Downloads/Optiscaler_0.9.0-pre3.20250911.7z
[2025-09-28 22:21:21,610][INFO]: Download complete: /home/deck/Downloads/Optiscaler_0.9.0-pre3.20250911.7z
[2025-09-28 22:21:21,611][INFO]: Extracting /home/deck/Downloads/Optiscaler_0.9.0-pre3.20250911.7z to /home/deck/opti
[2025-09-28 22:21:21,614][ERROR]: Extraction failed: /bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq

EDIT:

Manually moving the downloaded Optiscaler .7z file from Downloads to ~/opti and extracting it there solves this issue.

EDIT 2:
Still won't work. Logs say this now:
[2025-09-28 22:49:10,558][WARNING]: OptiScaler directory exists but missing files: ['nvapi64.dll', 'opti.sh', 'opti-uninstaller.sh', 'uninstall-nuclear.sh']

I could pull the .sh scripts from ~/homebrew/plugins/decky-optiscaler/assets but I'm not sure what's up with nvapi64.dll?