diff --git a/repository/TiddlyWiki/TiddlyWiki.class.st b/repository/TiddlyWiki/TiddlyWiki.class.st
index 9a359f3..c7c0ab5 100644
--- a/repository/TiddlyWiki/TiddlyWiki.class.st
+++ b/repository/TiddlyWiki/TiddlyWiki.class.st
@@ -302,10 +302,11 @@ TiddlyWiki >> exportJSONFileOptimized [
 	exporter := wikiFolder / 'scripts' / 'exportJsonFile'.
 	exporter exists ifFalse: [ self installJsonExporter ].
 	
-	OSSUnixSubprocess new 
+	GtSubprocessWithInMemoryOutput new 
 		command: exporter fullName;
 		workingDirectory: exporter parent fullName;
-		runAndWaitOnExitDo: [ :process :outString  | ^ self jsonFile ]
+		runAndWait. 
+	^ self jsonFile
 ]
 
 { #category : #accessing }
@@ -540,22 +541,20 @@ TiddlyWiki >> importSTONFilesFrom: aFolder [
 { #category : #accessing }
 TiddlyWiki >> installJsonExporter [
 	
-	| folder |
-	folder := (self file parent / 'scripts') ensureCreateDirectory.
+	| subfolder |
+	subfolder := (self folder / 'scripts') ensureCreateDirectory.
 	ZnClient new 
 		url: 'https://mutabit.com/repos.fossil/mutabit/uv/wiki/scripts/exportJsonFile';
-		downloadTo: folder / 'exportJsonFile'.
+		downloadTo: subfolder / 'exportJsonFile'.
 	ZnClient new
 		url: 'https://mutabit.com/repos.fossil/mutabit/doc/trunk/wiki/scripts/exportJsonFile.nim';
-		downloadTo: folder / 'exportJsonFile.nim'.
+		downloadTo: subfolder / 'exportJsonFile.nim'.
 	
-	OSSUnixSubprocess new 
-		command: 'chmod';
-		arguments: { '+x' . (folder / 'exportJsonFile') fullName };
-		workingDirectory: folder fullName;
-		redirectStdout;
-		redirectStderr;
-		runAndWaitOnExitDo: [ :process :outString | ^ outString ]
+	^ GtSubprocessWithInMemoryOutput new 
+		command: 'chmod +x ' , ((subfolder / 'exportJsonFile') fullName);
+		workingDirectory: subfolder fullName;
+		runAndWait;
+		stdout
 ]
 
 { #category : #accessing }