Update appveyor.yml

appveyor.yml

@@ -27,7 +27,7 @@ install:
   - cmd: "%PYTHON%\\python.exe -m pip install wheel"
   - cmd: "%PYTHON%\\python.exe -m pip install -r pip_requirements_tests.txt"
   - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (%PYTHON%\\python.exe -m pip install PyQt5==5.13.1 h5py xlsxwriter scipy hdf5storage fastparquet cChardet==2.1.5 psutil lxml))"
-  - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (%PYTHON%\\python.exe -m pip install pyinstaller pyqtgraph))"
+  - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (%PYTHON%\\python.exe -m pip install https://github.com/pyinstaller/pyinstaller/archive/develop.zip pyqtgraph))"
   - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (%PYTHON%\\python.exe -m pip install .))"
   - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (%PYTHON%\\Scripts\\pyinstaller asammdf_noconsole.spec))"
   - cmd: "if \"%PY%\" == \"37-x64\" ( if \"%APPVEYOR_REPO_BRANCH%\" == \"master\" (move dist\\asammdfgui.exe dist\\asammdfgui_%PY%_noconsole.exe))"
@@ -39,7 +39,7 @@ install:
   - sh: "python3 -m pip install --upgrade setuptools --user"
   - sh: "python3 -m pip install wheel --user"
   - sh: "python3 -m pip install -r pip_requirements_tests.txt --user"
-  - sh: "python3 -m pip install PyQt5>=5.13.1 h5py xlsxwriter scipy hdf5storage fastparquet cChardet==2.1.5 psutil pyinstaller pyqtgraph --user"
+  - sh: "python3 -m pip install PyQt5>=5.13.1 h5py xlsxwriter scipy hdf5storage fastparquet cChardet==2.1.5 psutil https://github.com/pyinstaller/pyinstaller/archive/develop.zip pyqtgraph --user"
   - sh: "python3 -m pip install . --user"
   - sh: >-
       if [ $APPVEYOR_REPO_BRANCH == "master" ] ; then