Package Manager - Failed to fetch packages from source

Hi. I’m trying to run package manager to install grasshopper plugins, but I keep encounter same error message. I tried solutions that were covered in forums previously, but nothing worked… How can I fix this? Thanks in advance.

Below is the System Info

Rhino 7 SR32 2023-8-9 (Rhino 7, 7.32.23221.10241, Git hash:master @ 3d9c816c4cd57561d12d8f53246bce304f314ba2)
License type: Educational Lab License, build 2023-08-09
License details: LAN Zoo Network Node

Windows 10 (10.0.19045 SR0.0) or greater (Physical RAM: 16Gb)

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: Radeon RX 560 Series (AMD) Memory: 2GB, Driver date: 3-30-2023 (M-D-Y). OpenGL Ver: 4.6.0 Compatibility Profile Context 22.20.27.09.230330
> Accelerated graphics device with 6 adapter port(s)
- Windows Main Display attached to adapter port 0

OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)

Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High

Vendor Name: ATI Technologies Inc.
Render version: 4.6
Shading Language: 4.60
Driver Date: 3-30-2023
Driver Version: 31.0.12027.9001
Maximum Texture size: 16384 x 16384
Z-Buffer depth: 24 bits
Maximum Viewport size: 16384 x 16384
Total Video Memory: 9940 MB

Rhino plugins that do not ship with Rhino

Rhino plugins that ship with Rhino
C:\Program Files\Rhino 7\Plug-ins\Commands.rhp “Commands” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\rdk.rhp “Renderer Development Kit”
C:\Program Files\Rhino 7\Plug-ins\RhinoRenderCycles.rhp “Rhino Render” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\rdk_etoui.rhp “RDK_EtoUI” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\rdk_ui.rhp “Renderer Development Kit UI”
C:\Program Files\Rhino 7\Plug-ins\NamedSnapshots.rhp “Snapshots”
C:\Program Files\Rhino 7\Plug-ins\RhinoCycles.rhp “RhinoCycles” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\Grasshopper\GrasshopperPlugin.rhp “Grasshopper” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\Toolbars\Toolbars.rhp “Toolbars” 7.32.23221.10241
C:\Program Files\Rhino 7\Plug-ins\3dxrhino.rhp “3Dconnexion 3D Mouse”
C:\Program Files\Rhino 7\Plug-ins\Displacement.rhp “Displacement”

It was a problem from the client. Someone who suffering from the same problem might solve the issue by updating root certificate of PC.

Windows + R > regedit > on the top search engine copy and paste: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\SystemCertificates\AuthRoot > Double click DisableRootAutoUpdate > Change your value to 0 (this might be 1) > reboot pc