Problem installing IJulia for 1.3.1 on Windows 10

Good evening,
I had Julia 1.2.0 running with IJulia. Now I tried updating to 1.3.1
After installing 1.3.1 I tried to add IJulia, but it fails. Complete fresh installs also do not help. I also cannot reinstall 1.2.0 with IJulia.
Reading various topics about this topic and experimenting with the ideas mentioned did not help. This is what I get:

“”"
_
_ _ ()_ | Documentation: https://docs.julialang.org
() | () () |
_ _ | | __ _ | Type “?” for help, “]?” for Pkg help.
| | | | | | |/ ` | |
| | |
| | | | (
| | | Version 1.3.1 (2019-12-30)
/ |_|||_’_| | Official https://julialang.org/ release
|__/ |

julia> using Pkg; Pkg.add(“IJulia”)
Cloning default registries into C:\Users\flori\.julia
Cloning registry from “https://github.com/JuliaRegistries/General.git
Added registry General to C:\Users\flori\.julia\registries\General
Resolving package versions…
Installed Conda ─────────── v1.3.0
Installed VersionParsing ── v1.2.0
Installed ZMQ ───────────── v1.0.0
Installed BinaryProvider ── v0.5.8
Installed JSON ──────────── v0.21.0
Installed Parsers ───────── v0.3.10
Installed SoftGlobalScope ─ v1.0.10
Installed IJulia ────────── v1.20.2
Installed MbedTLS ───────── v0.7.0
Updating C:\Users\flori\.julia\environments\v1.3\Project.toml
[7073ff75] + IJulia v1.20.2
Updating C:\Users\flori\.julia\environments\v1.3\Manifest.toml
[b99e7846] + BinaryProvider v0.5.8
[8f4d0f93] + Conda v1.3.0
[7073ff75] + IJulia v1.20.2
[682c06a0] + JSON v0.21.0
[739be429] + MbedTLS v0.7.0
[69de0a69] + Parsers v0.3.10
[b85f4697] + SoftGlobalScope v1.0.10
[81def892] + VersionParsing v1.2.0
[c2297ded] + ZMQ v1.0.0
[2a0f44e3] + Base64
[ade2ca70] + Dates
[8ba89e20] + Distributed
[7b1f6079] + FileWatching
[b77e0a4c] + InteractiveUtils
[76f85450] + LibGit2
[8f399da3] + Libdl
[56ddb016] + Logging
[d6f4376e] + Markdown
[a63ad114] + Mmap
[44cfe95a] + Pkg
[de0858da] + Printf
[3fa0cd96] + REPL
[9a3f8284] + Random
[ea8e919c] + SHA
[9e88b42a] + Serialization
[6462fe0b] + Sockets
[8dfed614] + Test
[cf7118a7] + UUIDs
[4ec0a83e] + Unicode
Building Conda ──→ C:\Users\flori\.julia\packages\Conda\kLXeC\deps\build.log
Building ZMQ ────→ C:\Users\flori\.julia\packages\ZMQ\ABGOx\deps\build.log
┌ Error: Error building ZMQ:
│ ┌ Warning: On Windows, creating file symlinks requires Administrator privileges
│ └ @ Base.Filesystem file.jl:848
│ ┌ Warning: platform_key() is deprecated, use platform_key_abi() from now on
│ │ caller = ip:0x0
│ └ @ Core :-1
│ ┌ Warning: Could not extract the platform key of https://github.com/JuliaInterop/ZMQBuilder/releases/download/v4.2.5+6/ZMQ.x86_64-w64-mingw32.tar.gz; continuing…
│ └ @ BinaryProvider C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\Prefix.jl:185
│ [ Info: Downloading https://github.com/JuliaInterop/ZMQBuilder/releases/download/v4.2.5+6/ZMQ.x86_64-w64-mingw32.tar.gz to C:\Users\flori.julia\packages\ZMQ\ABGOx\deps\usr\downloads\ZMQ.x86_64-w64-mingw32.tar.gz…
│ ERROR: LoadError: Could not download https://github.com/JuliaInterop/ZMQBuilder/releases/download/v4.2.5+6/ZMQ.x86_64-w64-mingw32.tar.gz to C:\Users\flori.julia\packages\ZMQ\ABGOx\deps\usr\downloads\ZMQ.x86_64-w64-mingw32.tar.gz:
│ ErrorException("")
│ Stacktrace:
│ [1] error(::String) at .\error.jl:33
│ [2] #download#93(::Bool, ::typeof(BinaryProvider.download), ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:502
│ [3] #download at .\none:0 [inlined]
│ [4] #download_verify#94(::Bool, ::Bool, ::Bool, ::typeof(download_verify), ::String, ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:571
│ [5] #download_verify at .\tuple.jl:0 [inlined]
│ [6] #install#133(::Prefix, ::String, ::Bool, ::Bool, ::Bool, ::typeof(install), ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\Prefix.jl:314
│ [7] (::BinaryProvider.var"#kw##install")(::NamedTuple{(:prefix, :force, :verbose),Tuple{Prefix,Bool,Bool}}, ::typeof(install), ::String, ::String) at .\tuple.jl:0
│ [8] top-level scope at C:\Users\flori.julia\packages\ZMQ\ABGOx\deps\build.jl:44
│ [9] include at .\boot.jl:328 [inlined]
│ [10] include_relative(::Module, ::String) at .\loading.jl:1105
│ [11] include(::Module, ::String) at .\Base.jl:31
│ [12] include(::String) at .\client.jl:424
│ [13] top-level scope at none:5
│ in expression starting at C:\Users\flori.julia\packages\ZMQ\ABGOx\deps\build.jl:40
│ caused by [exception 2]

│ Stacktrace:
│ [1] error() at .\error.jl:42
│ [2] #download#93(::Bool, ::typeof(BinaryProvider.download), ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:496
│ [3] #download at .\none:0 [inlined]
│ [4] #download_verify#94(::Bool, ::Bool, ::Bool, ::typeof(download_verify), ::String, ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:571
│ [5] #download_verify at .\tuple.jl:0 [inlined]
│ [6] #install#133(::Prefix, ::String, ::Bool, ::Bool, ::Bool, ::typeof(install), ::String, ::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\Prefix.jl:314
│ [7] (::BinaryProvider.var"#kw##install")(::NamedTuple{(:prefix, :force, :verbose),Tuple{Prefix,Bool,Bool}}, ::typeof(install), ::String, ::String) at .\tuple.jl:0
│ [8] top-level scope at C:\Users\flori.julia\packages\ZMQ\ABGOx\deps\build.jl:44
│ [9] include at .\boot.jl:328 [inlined]
│ [10] include_relative(::Module, ::String) at .\loading.jl:1105
│ [11] include(::Module, ::String) at .\Base.jl:31
│ [12] include(::String) at .\client.jl:424
│ [13] top-level scope at none:5
│ caused by [exception 1]
│ IOError: symlink: operation not permitted (EPERM)
│ Stacktrace:
│ [1] uv_error at .\libuv.jl:97 [inlined]
│ [2] symlink(::String, ::String) at .\file.jl:851
│ [3] probe_symlink_creation(::String) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:121
│ [4] #probe_platform_engines!#30(::Bool, ::typeof(BinaryProvider.probe_platform_engines!)) at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:175
│ [5] probe_platform_engines! at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\PlatformEngines.jl:169 [inlined]
│ [6] init() at C:\Users\flori.julia\packages\BinaryProvider\kcGxO\src\BinaryProvider.jl:28
│ [7] _include_from_serialized(::String, ::Array{Any,1}) at .\loading.jl:692
│ [8] _require_from_serialized(::String) at .\loading.jl:743
│ [9] _require(::Base.PkgId) at .\loading.jl:1034
│ [10] require(::Base.PkgId) at .\loading.jl:922
│ [11] require(::Module, ::Symbol) at .\loading.jl:917
│ [12] include at .\boot.jl:328 [inlined]
│ [13] include_relative(::Module, ::String) at .\loading.jl:1105
│ [14] include(::Module, ::String) at .\Base.jl:31
│ [15] include(::String) at .\client.jl:424
│ [16] top-level scope at none:5
│ Ausnahme beim Aufrufen von “DownloadFile” mit 2 Argument(en): “Timeout f�r den Vorgang wurde �berschritten.”
│ In Zeile:5 Zeichen:1
│ + $webclient.DownloadFile(“https://github.com/JuliaInterop/ZMQBuilder/r
│ + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
│ + CategoryInfo : NotSpecified: (:slight_smile: , MethodInvocationException
│ + FullyQualifiedErrorId : WebException

└ @ Pkg.Operations D:\buildbot\worker\package_win64\build\usr\share\julia\stdlib\v1.3\Pkg\src\backwards_compatible_isolation.jl:649
Building MbedTLS → C:\Users\flori\.julia\packages\MbedTLS\a1JFn\deps\build.log
Building IJulia ─→ C:\Users\flori\.julia\packages\IJulia\F1GUo\deps\build.log
“””

Maybe this is of relevance for you:

You could try to update powershell.

And this thread seems to have the same error message:

and also some solutions.

Thanks @oheil for the given indications. They did not help, unfortunately.

However meanwhile everything went through.I have played with all sorts of indications and reinstalled again and again, even manualy cleaning the rest of the old installations, doing a reboot every cycle. Suddenly it went through, no more errors.
As far I have identified the problem now, it was the availibilty of this resource:

[https://github.com/JuliaInterop/ZMQBuilder/releases/download/v4.2.5+6/ZMQ.x86_64-w64-mingw32.tar.gz]

This morning it gave me a 404 now it is available (again).