pynsist: use an older Python for Windows 10

Newer versions of Python + PyQt5 don't work on Windows 10.

Related-to: takluyver/pynsist#176
Resolves: git-cola#1227

pynsist.cfg

@@ -1,38 +1,38 @@
 # https://pynsist.readthedocs.io/en/latest/cfgfile.html
 
 [Application]
-name = git-cola
-version = 3.12.0
-entry_point = cola.main:shortcut_launch
-icon = cola/icons/git-cola.ico
-extra_preamble = contrib/win32/pynsist-preamble.py
+name=git-cola
+version=3.12.0
+entry_point=cola.main:shortcut_launch
+icon=cola/icons/git-cola.ico
+extra_preamble=contrib/win32/pynsist-preamble.py
 
 # We might want to pursue shell integration, which would at minimum require a
 # custom template.  https://pynsist.readthedocs.io/en/latest/design.html
 # [Build]
-# nsi_template = contrib/win32/pynsist-template.nsi
+# nsi_template=contrib/win32/pynsist-template.nsi
 
 [Python]
-version = 3.9.13
-bitness = 64
-format = bundled
+version=3.7.9
+bitness=64
+include_msvcrt=true
 
 [Shortcut git-dag]
-entry_point = cola.dag:shortcut_launch
-icon = cola/icons/git-cola.ico
-extra_preamble = contrib/win32/pynsist-preamble.py
+entry_point=cola.dag:shortcut_launch
+icon=cola/icons/git-cola.ico
+extra_preamble=contrib/win32/pynsist-preamble.py
 
 [Command git-cola]
-entry_point = cola.main:winmain
-extra_preamble = contrib/win32/pynsist-preamble.py
+entry_point=cola.main:winmain
+extra_preamble=contrib/win32/pynsist-preamble.py
 
 [Command git-cola-sequence-editor]
-entry_point = cola.sequenceeditor:winmain
-extra_preamble = contrib/win32/pynsist-preamble.py
+entry_point=cola.sequenceeditor:winmain
+extra_preamble=contrib/win32/pynsist-preamble.py
 
 [Command git-dag]
-entry_point = cola.dag:winmain
-extra_preamble = contrib/win32/pynsist-preamble.py
+entry_point=cola.dag:winmain
+extra_preamble=contrib/win32/pynsist-preamble.py
 
 # To identify unused DLL files to exclude, we can use Process Explorer.
 # https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer
@@ -44,13 +44,15 @@ extra_preamble = contrib/win32/pynsist-preamble.py
 # This gives a list of necessary DLLs and the rest can be excluded.
 
 [Include]
-packages = cola
-pypi_wheels = PyQt5==5.15.6
-    pywin32==227
+packages=cola
+pypi_wheels= packaging==21.3
+    PyQt5==5.14.2
+    PyQt5-sip==12.7.2
+    pywin32==304
     QtPy==2.0.1
     send2trash==1.8.0
-files = share/
-exclude = pkgs/PyQt5/Qt/bin/Qt5Bluetooth.dll
+files=share/
+exclude= pkgs/PyQt5/Qt/bin/Qt5Bluetooth.dll
     pkgs/PyQt5/Qt/bin/Qt5DBus.dll
     pkgs/PyQt5/Qt/bin/Qt5Designer.dll
     pkgs/PyQt5/Qt/bin/Qt5Help.dll