diff --git a/src/ExtEnvi/ByteString.extension.st b/src/ExtEnvi/ByteString.extension.st
new file mode 100644
index 0000000..b1a7776
--- /dev/null
+++ b/src/ExtEnvi/ByteString.extension.st
@@ -0,0 +1,6 @@
+Extension { #name : #ByteString }
+
+{ #category : #'*ExtEnvi' }
+ByteString >> parsePipInstallStdout [
+	^ self lines collect: [ :line | line splitOn: ':' ]
+]
diff --git a/src/ExtEnvi/PyEnv.class.st b/src/ExtEnvi/PyEnv.class.st
index 6da6ca7..fa7fad5 100644
--- a/src/ExtEnvi/PyEnv.class.st
+++ b/src/ExtEnvi/PyEnv.class.st
@@ -57,18 +57,19 @@ PyEnv >> install: packageName [
 
 { #category : #accessing }
 PyEnv >> install: aPackageName in: anEnvDirName [
-	| bins pip |
+	| bins pip stdout |
 	(envs includesKey: anEnvDirName)
 		ifFalse: [ InformDebugger inform: 'Env doesn''t exist'.
 			^ self ].
 	bins := (envs at: anEnvDirName) / 'bin'.
 	pip := (bins / 'pip') fullName.
-	^ GtSubprocessWithInMemoryOutput new
-		workingDirectory: workingDirectory;
-		command: pip;
-		arguments: #('install' 'instaloader');
-		runAndWait;
-		stdout
+	stdout := GtSubprocessWithInMemoryOutput new
+			workingDirectory: workingDirectory;
+			command: pip;
+			arguments: #('install' 'instaloader');
+			runAndWait;
+			stdout.
+	^ stdout parsePipInstallStdout
 ]
 
 { #category : #accessing }