diff --git a/contrib/automation/hgautomation/windows.py b/contrib/automation/hgautomation/windows.py
--- a/contrib/automation/hgautomation/windows.py
+++ b/contrib/automation/hgautomation/windows.py
@@ -108,10 +108,10 @@
 WHEEL_FILENAME_PYTHON38_X86 = 'mercurial-{version}-cp38-cp38-win32.whl'
 WHEEL_FILENAME_PYTHON38_X64 = 'mercurial-{version}-cp38-cp38-win_amd64.whl'
 
-X86_EXE_FILENAME = 'Mercurial-{version}.exe'
-X64_EXE_FILENAME = 'Mercurial-{version}-x64.exe'
-X86_MSI_FILENAME = 'mercurial-{version}-x86.msi'
-X64_MSI_FILENAME = 'mercurial-{version}-x64.msi'
+X86_EXE_FILENAME = 'Mercurial-{version}-x86-python2.exe'
+X64_EXE_FILENAME = 'Mercurial-{version}-x64-python2.exe'
+X86_MSI_FILENAME = 'mercurial-{version}-x86-python2.msi'
+X64_MSI_FILENAME = 'mercurial-{version}-x64-python2.msi'
 
 MERCURIAL_SCM_BASE_URL = 'https://mercurial-scm.org/release/windows'
 
diff --git a/contrib/packaging/hgpackaging/inno.py b/contrib/packaging/hgpackaging/inno.py
--- a/contrib/packaging/hgpackaging/inno.py
+++ b/contrib/packaging/hgpackaging/inno.py
@@ -111,6 +111,7 @@
         iscc_exe,
         version,
         arch="x64" if vc_x64 else None,
+        suffix="-python2",
     )
 
 
@@ -150,6 +151,7 @@
     iscc_exe: pathlib.Path,
     version,
     arch=None,
+    suffix="",
 ):
     """Build an Inno installer from staged Mercurial files.
 
@@ -214,6 +216,9 @@
 
     if arch:
         args.append('/dARCH=%s' % arch)
+        args.append('/dSUFFIX=-%s%s' % (arch, suffix))
+    else:
+        args.append('/dSUFFIX=-x86%s' % suffix)
 
     if not version:
         version = read_version_py(source_dir)
diff --git a/contrib/packaging/hgpackaging/wix.py b/contrib/packaging/hgpackaging/wix.py
--- a/contrib/packaging/hgpackaging/wix.py
+++ b/contrib/packaging/hgpackaging/wix.py
@@ -358,6 +358,7 @@
         version=version,
         python2=True,
         msi_name=msi_name,
+        suffix="-python2",
         extra_wxs=extra_wxs,
         extra_features=extra_features,
         signing_info=signing_info,
@@ -415,6 +416,7 @@
     version: str,
     python2: bool,
     msi_name: typing.Optional[str] = "mercurial",
+    suffix: str = "",
     extra_wxs: typing.Optional[typing.Dict[str, str]] = None,
     extra_features: typing.Optional[typing.List[str]] = None,
     signing_info: typing.Optional[typing.Dict[str, str]] = None,
@@ -489,7 +491,9 @@
     run_candle(wix_path, build_dir, source, source_build_rel, defines=defines)
 
     msi_path = (
-        source_dir / 'dist' / ('%s-%s-%s.msi' % (msi_name, orig_version, arch))
+        source_dir
+        / 'dist'
+        / ('%s-%s-%s%s.msi' % (msi_name, orig_version, arch, suffix))
     )
 
     args = [
diff --git a/contrib/packaging/inno/mercurial.iss b/contrib/packaging/inno/mercurial.iss
--- a/contrib/packaging/inno/mercurial.iss
+++ b/contrib/packaging/inno/mercurial.iss
@@ -9,14 +9,13 @@
 AppCopyright=Copyright 2005-2020 Matt Mackall and others
 AppName=Mercurial
 AppVersion={#VERSION}
+OutputBaseFilename=Mercurial-{#VERSION}{#SUFFIX}
 #if ARCH == "x64"
 AppVerName=Mercurial {#VERSION} (64-bit)
-OutputBaseFilename=Mercurial-{#VERSION}-x64
 ArchitecturesAllowed=x64
 ArchitecturesInstallIn64BitMode=x64
 #else
 AppVerName=Mercurial {#VERSION}
-OutputBaseFilename=Mercurial-{#VERSION}
 #endif
 InfoAfterFile=../postinstall.txt
 LicenseFile=Copying.txt