--- title: "OptiScaler how-to pages | OptiScaler" description: "Query-shaped how-tos: how to install, open the overlay, enable FSR4, fix a missing overlay and remove OptiScaler cleanly." canonical: https://optiscaler.ink/how-to updated: 2026-10-18 --- # OptiScaler how-to: install, overlay, FSR4 and fixes Query-shaped how-tos: how to install, open the overlay, enable FSR4, fix a missing overlay and remove OptiScaler cleanly. ## Facts (2026-10-18) - **Version:** OptiScaler 0.9.4 (reference build, July 2026) - **APIs:** DirectX 11, DirectX 12, Vulkan - **Upscalers:** DLSS, FSR and XeSS inputs/outputs where compatible - **Frame generation:** Experimental OptiFG (DirectX 12) - **Overlay:** Insert key - **Install:** ZIP extracted next to the main game executable - **Platform:** Windows; Linux via Proton/Wine varies - **Site:** Independent guide — not the official project site ## What this hub is Query-shaped how-tos: how to install, open the overlay, enable FSR4, fix a missing overlay and remove OptiScaler cleanly. OptiScaler 0.9.4 is a community translation layer for DirectX 11, DirectX 12 and Vulkan games. This host is an independent guide, not the official project site. Start from [Download](https://optiscaler.ink/download), then come back here for the per-game checks. ## The safe order 1. Back up the game folder. 2. Extract the ZIP next to the main game executable. 3. Launch offline and press Insert. 4. Change one output at a time, and never test in online or anti-cheat protected games. ## Pages in OptiScaler how-to - [How to install OptiScaler](https://optiscaler.ink/how-to/how-to-install-optiscaler) — Extract the required files beside the main game executable and follow the setup method suitable for that game. Always back up replaced files first. - [How to open the OptiScaler overlay with Insert](https://optiscaler.ink/how-to/how-to-open-the-overlay) — Insert is commonly used to open the overlay. Some keyboard layouts may need an alternate combination depending on the game and configuration. - [How to fix the OptiScaler overlay not showing](https://optiscaler.ink/how-to/how-to-fix-overlay-not-showing) — Common causes include an incorrect install folder, the wrong proxy DLL, input-hook conflicts, overlays, or a game-specific compatibility issue. - [How to fix a game crash after installing OptiScaler](https://optiscaler.ink/how-to/how-to-fix-game-crash-after-install) — Remove the added files to confirm the cause, then check the correct game executable folder, proxy selection, API support, and known compatibility limitations. - [How to enable FSR4 with OptiScaler](https://optiscaler.ink/how-to/how-to-enable-fsr4) — FSR4 depends on the selected output path, GPU capability, driver or SDK behavior, and game compatibility. Enable it in the overlay, then verify it is not a fallback. - [How to tell if FSR4 is really active in OptiScaler](https://optiscaler.ink/how-to/how-to-check-fsr4-is-active) — Use the available OptiScaler status or watermark indicators where supported and verify that the reported output matches the intended FSR4 mode rather than a fallback. - [How to use OptiScaler on Linux through Proton](https://optiscaler.ink/how-to/how-to-use-optiscaler-on-linux) — Linux use is possible in supported configurations, commonly through Proton or Wine, but Vulkan, driver, and upscaler requirements can differ from Windows. - [How to find the folder OptiScaler must go in](https://optiscaler.ink/how-to/how-to-find-the-game-executable-folder) — OptiScaler goes next to the main game executable, not the launcher shortcut. Every store can open that folder for you. - [How to remove OptiScaler from a game](https://optiscaler.ink/how-to/how-to-remove-optiscaler) — Removing OptiScaler is deleting the files you added and restoring any renamed originals from your backup. The game then runs stock again. - [How to back up a game folder before installing OptiScaler](https://optiscaler.ink/how-to/how-to-back-up-before-install) — A backup makes every OptiScaler test reversible: copy the files that may be replaced, note INI changes, and keep one known-good setup per game. ## FAQ ### What is OptiScaler? OptiScaler is a community tool that can intercept supported in-game upscaler calls and redirect them to another supported upscaling backend, with additional tuning options. ### How does OptiScaler work in a game? The game exposes an input upscaler, OptiScaler sits between the game and the selected output backend, and the chosen output handles the final upscaling path where compatibility allows. ### Does OptiScaler support DirectX 11? Yes, DirectX 11 is supported, although the available output methods and behavior can differ from DirectX 12. ### Does OptiScaler support DirectX 12? Yes. DirectX 12 has broad support and is also the API used by experimental OptiFG functionality. ## Related - [OptiScaler FAQ: the official 20 questions, answered](https://optiscaler.ink/faq) - [OptiScaler guides: install, FSR4, Linux, performance and safety](https://optiscaler.ink/guides) - [How to install OptiScaler](https://optiscaler.ink/how-to/how-to-install-optiscaler) - [How to open the OptiScaler overlay with Insert](https://optiscaler.ink/how-to/how-to-open-the-overlay) - [How to fix the OptiScaler overlay not showing](https://optiscaler.ink/how-to/how-to-fix-overlay-not-showing) - [How to fix a game crash after installing OptiScaler](https://optiscaler.ink/how-to/how-to-fix-game-crash-after-install) ## Download ZIP next to the game executable: [Download OptiScaler](https://optiscaler.ink/download) Markdown mirror: https://optiscaler.ink/how-to.md