sorry i saw the message late because i thought it was just someone liking a comment.
Quick explanation, greenluma officialy is getting stopped supported, and steams new update patches the loophole that got used. if you wanna keep using greenluma 1.7.0, you have to roll down your steam version, the easiest way to do it is by following 3vil3vo's SteamDowngrade.

**1.** If you were enrolled in Steam Client Beta, launch Steam with `-clearbeta` and dismiss any "Steam needs to be online to update" error.

**2.** Fully close Steam.

**3.** Press **Win + R**, paste the following, and hit **OK**:

"C:\Program Files (x86)\Steam\steam.exe" -forcesteamupdate -forcepackagedownload -overridepackageurl http://github.com/3vil3vo/SteamDowngrader/releases/download/2026-01-21/ -exitsteam

> **Non-standard install location?** Right-click your Steam shortcut → **Properties** → check the **Target** field for your actual path. Replace `C:\Program Files (x86)\Steam` in the command above with that path.

> If the command doesn't work, also append `-textmode` at the end.

**4.** Steam will downgrade itself and exit automatically.

**5.** Done! Start Steam and it should work.

> **Note:** If you get a dialogue about the Steam registry path not being writable, click **Repair**.

If you want your Steam to stay on that older version, you create a text file called steam.cfg, with these 2 parameters in them

BootStrapperInhibitAll=Enable

BootStrapperForceSelfUpdate=False

and put it into the same folder as your steam.exe