I cannot install Plots in Julia 1.6.1

General Usage
1 
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.6.1 (2021-04-23)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

(@v1.6) pkg> st
      Status `C:\Users\Hermesr\.julia\environments\v1.6\Project.toml` (empty project)

(@v1.6) pkg> add Plots
    Updating registry at `C:\Users\Hermesr\.julia\registries\General`
┌ Warning: could not download https://pkg.julialang.org/registries
└ @ Pkg.Types C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.6\Pkg\src\Types.jl:980
   Resolving package versions...
     Cloning [77ba4419-2d1f-58cd-9bb1-8ffee604a2e3] NaNMath from https://github.com/mlubin/NaNMath.jl.git
ERROR: failed to clone from https://github.com/mlubin/NaNMath.jl.git, error: GitError(Code:ERROR, Class:OS, failed to send request: The connection with the server was terminated abnormally
)

(@v1.6) pkg>
2 
(@v1.5) pkg> st
Status `C:\Users\Hermesr\.julia\environments\v1.5\Project.toml`
  [91a5bcdd] Plots v1.12.0

(@v1.5) pkg> add Roots
   Updating registry at `C:\Users\Hermesr\.julia\registries\General`
  Resolving package versions...
  Installed Roots ─ v1.0.8
Updating `C:\Users\Hermesr\.julia\environments\v1.5\Project.toml`
  [f2b01f46] + Roots v1.0.8
Updating `C:\Users\Hermesr\.julia\environments\v1.5\Manifest.toml`
  [f2b01f46] + Roots v1.0.8

(@v1.5) pkg> st
Status `C:\Users\Hermesr\.julia\environments\v1.5\Project.toml`
  [91a5bcdd] Plots v1.12.0
  [f2b01f46] Roots v1.0.8

(@v1.5) pkg>