Hi,
When I installed cadabra 2.2.7  in win10, I met following errors:
-- Downloading http://ftp.gnome.org/pub/GNOME/sources/atkmm/2.24/atkmm- 
 2.24.2.tar.xz...
 CMake Error at scripts/cmake/vcpkg_download_distfile.cmake:96 (message):
 File does not have expected hash:
     File path: [ D:/ProgramData/Vcpkg/vcpkg/downloads/temp/atkmm-2.24.2.tar.xz ]
     Expected hash: [ 427714cdf3b10e3f9bc36df09c4b05608d295f5895fb1e079
       b9bd84afdf7bf1cfdec6794ced7f1e35bd430b76f87792
       df4ee63c515071a2ea6e3e51e672cdbe2 ]
    Actual hash: [ 2edac66538c334ec6957e2a518d0a714c60
       7655f75c838dcbe4e5f5b30c2ea87a703bc11bf4125837cd
       13d520071a8ec292c93550176218ab7e195a52078f888 ]
    The file may have been corrupted in transit.  This can be caused by
    proxies.  If you use a proxy, please set the HTTPS_PROXY and HTTP_PROXY
    environment variables to
   "https://user:password@your-proxy-ip-address:port/".
   Call Stack (most recent call first):
   scripts/cmake/vcpkg_download_distfile.cmake:179 (test_hash)
   ports/atkmm/portfile.cmake:6 (vcpkg_download_distfile)
   scripts/ports.cmake:85 (include)
  Error: Building package atkmm:x64-windows failed with: BUILD_FAILED
 Please ensure you're using the latest portfiles with `.\vcpkg update`, then
 submit an issue at https://github.com/Microsoft/vcpkg/issues including:
 Package: atkmm:x64-windows
 Vcpkg version: 2019.08.27-nohash
Additionally, attach any relevant sections from the log files above.
When I downloaded it from  http://ftp.gnome.org/pub/GNOME/sources/atkmm/2.24/atkmm-2.24.2.tar.xz and put it to folder "downloads", following errors come up
  Starting package 1/4: atkmm:x64-windows
  Building package atkmm[core]:x64-windows...
  -- Using cached D:/ProgramData/Vcpkg/vcpkg/downloads/atkmm-2.24.2.tar.xz
   CMake Error at scripts/cmake/vcpkg_download_distfile.cmake:96 (message):
   File does not have expected hash:
   File path: [ D:/ProgramData/Vcpkg/vcpkg/downloads/atkmm-2.24.2.tar.xz ]
  Expected hash: [ 427714cdf3b10e3f9bc36df09c4b05608d295f5895fb1e079b9bd84afdf7bf1cfdec6794ced7f1e35bd430b76f87792df4ee63c515071a2ea6e3e51e672cdbe2 ]
    Actual hash: [ 9d59ccad0c4f1bfce55a30b9f56c2eb8c9333cb6548e35052169b1558db1eaada30831424edeed1d46968b40068348a3d7e91168f519513317b1f7b9e04a7fc9 ]
 Please delete the file and retry if this file should be downloaded again.
 Call Stack (most recent call first):
 scripts/cmake/vcpkg_download_distfile.cmake:107 (test_hash)
 ports/atkmm/portfile.cmake:6 (vcpkg_download_distfile)
 scripts/ports.cmake:85 (include)
  Error: Building package atkmm:x64-windows failed with: BUILD_FAILED
 Please ensure you're using the latest portfiles with `.\vcpkg update`, then
 submit an issue at https://github.com/Microsoft/vcpkg/issues including:
 Package: atkmm:x64-windows
 Vcpkg version: 2019.08.27-nohash
How to solve it?