在win7上无法使用Pkg Server，只能使用github clone进行General registry更新，执行]registry add General后提示：
Warning: could not download https://pkg.julialang.org/registries
@ Pkg.Types C:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.5\Pkg\src\Types.jl:951
Cloning registry from “GitHub - JuliaRegistries/General: The official registry of general Julia packages”
经测试，在将JULIA_PKG_SERVER改为cn-east.pkg.julialang.org、tuna源或北外源均无法解决此问题。
执行]st结果：
Status C:\Users\Administrator\.julia\environments\v1.5\Project.toml (empty project)
执行versioninfo()结果：
Julia Version 1.5.3
Commit 788b2c77c1 (2020-11-09 13:37 UTC)
Platform Info:
OS: Windows (x86_64-w64-mingw32)
CPU: Intel(R) Core™ i7-4702MQ CPU @ 2.20GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-9.0.1 (ORCJIT, haswell)
请问该如何解决？