diff --git a/packages/win_installer/fragment_spelling.iss b/packages/win_installer/fragment_spelling.iss
index 8e4168727..8a5bca5e1 100644
--- a/packages/win_installer/fragment_spelling.iss
+++ b/packages/win_installer/fragment_spelling.iss
@@ -1,5 +1,5 @@
 ; This file declares all installables related to spell checking and thesaurii in Aegisub
 
 [Files]
-Source: {#DEPS_DIR}\dictionaries\en_US.aff; DestDir: {app}\dictionaries; Flags: ignoreversion; Components: dictionaries/en_US
-Source: {#DEPS_DIR}\dictionaries\en_US.dic; DestDir: {app}\dictionaries; Flags: ignoreversion; Components: dictionaries/en_US
+Source: {#DEPS_DIR}\dictionaries\en_US.aff; DestDir: {app}\dictionaries; Flags: skipifsourcedoesntexist ignoreversion; Components: dictionaries/en_US
+Source: {#DEPS_DIR}\dictionaries\en_US.dic; DestDir: {app}\dictionaries; Flags: skipifsourcedoesntexist ignoreversion; Components: dictionaries/en_US
diff --git a/tools/osx-bundle.sh b/tools/osx-bundle.sh
index 813151a55..cefa8d0c2 100755
--- a/tools/osx-bundle.sh
+++ b/tools/osx-bundle.sh
@@ -64,8 +64,8 @@ else
   mkdir -p "${BUILD_DIR}/dictionaries"
   if ! test -f "${BUILD_DIR}/dictionaries/en_US.aff"; then
       echo "Specified dictionary directory ${DICT_DIR} not found. Downloading dictionaries:"
-      curl -L "https://downloads.sourceforge.net/project/openofficeorg.mirror/contrib/dictionaries/en_US.zip" -o "${BUILD_DIR}/dictionaries/en_US.zip"
-      unzip "${BUILD_DIR}/dictionaries/en_US.zip" -d "${BUILD_DIR}/dictionaries"
+      curl -L "https://raw.githubusercontent.com/TypesettingTools/Aegisub-dictionaries/master/dicts/en_US.aff" -o "${BUILD_DIR}/dictionaries/en_US.aff"
+      curl -L "https://raw.githubusercontent.com/TypesettingTools/Aegisub-dictionaries/master/dicts/en_US.dic" -o "${BUILD_DIR}/dictionaries/en_US.dic"
   fi
   cp -v "${BUILD_DIR}/dictionaries/en_US.aff" "${PKG_DIR}/Contents/SharedSupport/dictionaries"
   cp -v "${BUILD_DIR}/dictionaries/en_US.dic" "${PKG_DIR}/Contents/SharedSupport/dictionaries"
diff --git a/tools/win-installer-setup.ps1 b/tools/win-installer-setup.ps1
index 2938faa78..8ffb8af73 100644
--- a/tools/win-installer-setup.ps1
+++ b/tools/win-installer-setup.ps1
@@ -137,10 +137,8 @@ if (!(Test-Path XAudio2_redist)) {
 # dictionaries
 if (!(Test-Path dictionaries)) {
 	New-Item -ItemType Directory dictionaries
-	[Net.ServicePointManager]::SecurityProtocol = "Tls12" 	# Needed since otherwise downloading fails in some places like on the GitHub CI: https://stackoverflow.com/a/66614041/4730656
-	Invoke-WebRequest https://downloads.sourceforge.net/project/openofficeorg.mirror/contrib/dictionaries/en_US.zip -UserAgent "Wget" -OutFile en_US.zip -UseBasicParsing
-	Expand-Archive -LiteralPath en_US.zip -DestinationPath dictionaries
-	Remove-Item en_US.zip
+	Invoke-WebRequest https://raw.githubusercontent.com/TypesettingTools/Aegisub-dictionaries/master/dicts/en_US.aff -OutFile dictionaries/en_US.aff -UseBasicParsing
+	Invoke-WebRequest https://raw.githubusercontent.com/TypesettingTools/Aegisub-dictionaries/master/dicts/en_US.dic -OutFile dictionaries/en_US.dic -UseBasicParsing
 }
 
 # localization