What it means
Publisher identity is not signed yet
This warning is expected for an unsigned indie Windows app. The warning by itself is not an antivirus result and is not a safety guarantee either.
Free tier for Windows
Download YUKFUES Optimization Utility
Start with 43 working tweaks, the full benchmark, Share My Score, and Restore Center. If you want the full set later, activate PRO inside the app with a Gumroad license key.
Official installer published through YUKFUE's GitHub Releases. Verify the filename and SHA-256 shown below before running it.
v6.40.0
Current version
Windows 10 / 11 (64-bit)
Platform
43 working tweaks
Free tier
149 additional tweaks
PRO upgrade
$19.99 once
Price
None
Subscription
SmartScreen, explained
A warning can appear. Here is why.
The installer is not yet code-signed. On first run, Windows SmartScreen may show “Unknown publisher” or “Windows protected your PC” because Windows cannot verify a signed publisher identity.
Read the full safety explanation →What you should do
Verify before running
Use only the official link on this page. Review any Windows or antivirus warning instead of dismissing it blindly. If the source or file details do not match, stop.
Verify before running
Match the file to the published release
- Version
- v6.40.0
- Filename
- YUKFUE_Setup_v6.40.0_public.exe
- SHA-256
- 62685B59E453D3A77B57C2C4992249524E9EA9D04730828E6204573B9D965AF0
- Official source
- GitHub Releases →
In PowerShell, compare the result of this command with the SHA-256 above:
Get-FileHash ".\YUKFUE_Setup_v6.40.0_public.exe" -Algorithm SHA256If the filename, checksum, or source does not match, do not run the file. Do not substitute a mirror, random reupload, or binary posted in chat.
Before you run it
Keep the first run deliberate.
A few checks make the setup easier to understand and give your before-and-after result useful context.
01
Use the official source
Use the official GitHub release link on this page, then confirm the filename and SHA-256 before running it. Do not substitute links from reposts or messages.
02
Expect elevation
Windows optimization touches settings such as services, power plans, and the registry, so administrator rights are recommended and the app requests elevation.
03
Measure before changes
Run the built-in benchmark first to establish your own baseline. Results vary by system, so your before-and-after comparison matters more than a marketing number.
04
Review before applying
Use the Free-vs-PRO comparison and review each change. Supported tweaks are backed up for Restore Center; rare one-way actions are labeled before you choose them.
Free
Useful before you pay.
Free includes 43 working tweaks across the categories, the full System Benchmark, Share My Score, Gaming Presets browsing, and Restore Center. There is no timer.
Download Free — v6.40.0 →PRO
The full set, once.
PRO unlocks the remaining 149 tweaks plus the documented PRO tools for $19.99 one time. It is an optional upgrade, not a subscription.
Compare the exact split →PRO activation
Buy once. Activate with your key.
You can install and use Free first. When you choose PRO, the documented activation flow is short and stays inside the app.
Get PRO — $19.99- 01
Buy on Gumroad
Use the verified YUKFUE Gumroad product page.
- 02
Receive your key
Gumroad emails the license key after purchase.
- 03
Open activation
In YUKFUE, open the license and activation dialog.
- 04
Paste the key
Paste the Gumroad key to activate PRO on your PC.
Questions before installing?
Check first. Ask when you need help.
Use the documentation or join the verified Discord for community help and release announcements. No response-time promise is implied.
Official GitHub release
Download the verified release. Check it before running.
Use the official GitHub asset for v6.40.0, then compare the filename and SHA-256 with the release details on this page.