diff --git a/Bio3DColorado/IMOD.download.recipe b/Bio3DColorado/IMOD.download.recipe
index ee92499..86fa30c 100644
--- a/Bio3DColorado/IMOD.download.recipe
+++ b/Bio3DColorado/IMOD.download.recipe
@@ -3,11 +3,18 @@
 <plist version="1.0">
 <dict>
 	<key>Description</key>
-	<string>Downloads the latest version of IMOD.</string>
+	<string>Downloads the latest version of IMOD.
+
+Valid values for ARCH include:
+- "intel" (default, Intel)
+- "arm64" (Apple Silicon)
+</string>
 	<key>Identifier</key>
 	<string>com.github.scriptingosx.download.IMOD</string>
 	<key>Input</key>
 	<dict>
+		<key>ARCH</key>
+		<string>intel</string>
 		<key>NAME</key>
 		<string>IMOD</string>
 	</dict>
@@ -19,7 +26,7 @@
 			<key>Arguments</key>
 			<dict>
 				<key>re_pattern</key>
-				<string>(?P&lt;url&gt;osx/(?P&lt;scriptname&gt;imod_(?P&lt;version&gt;\d+\.\d+\.\d+)_osx64_(?P&lt;osx_version&gt;10\.\d+)_(?P&lt;cuda_version&gt;CUDA\d+\.\d+)\..*sh))</string>
+				<string>(osx/imod_[\d\.]+(_osx\d+)?_%ARCH%\.pkg)</string>
 				<key>result_output_var_name</key>
 				<string>url</string>
 				<key>url</key>
@@ -41,6 +48,21 @@
 			<key>Processor</key>
 			<string>EndOfCheckPhase</string>
 		</dict>
+		<dict>
+			<key>Arguments</key>
+			<dict>
+				<key>expected_authority_names</key>
+				<array>
+					<string>Developer ID Installer: David Mastronarde (JNF2CPUCK9)</string>
+					<string>Developer ID Certification Authority</string>
+					<string>Apple Root CA</string>
+				</array>
+				<key>input_path</key>
+				<string>%pathname%</string>
+			</dict>
+			<key>Processor</key>
+			<string>CodeSignatureVerifier</string>
+		</dict>
 	</array>
 </dict>
 </plist>