diff --git a/offline-minecraft-launcher.py b/offline-minecraft-launcher.py
index 1e63732..4874ce7 100644
--- a/offline-minecraft-launcher.py
+++ b/offline-minecraft-launcher.py
@@ -318,7 +318,9 @@ def main():
 	for library in libraries:
 		if library["type"] == "native":
 			if "rules" in library and checkRules(library["rules"]) == "disallow": continue
-			subprocess.run(["7z","x",library["filePathOS"],"-o" +nativesOutPath,"-aos"],check=True,stdout=subprocess.DEVNULL)
+			proc = subprocess.Popen(["7z","x",library["filePathOS"],"-o" +nativesOutPath,"-aos"],stdout=subprocess.DEVNULL)
+			rtn = proc.wait()
+			if rtn != 0: raise Exception("process","return code isn't 0")
 	
 	print("\nSetting up launcher variables...")
 	launcherVariables = {}
@@ -379,13 +381,14 @@ def main():
 	
 	print("\nLaunching Minecraft...")
 	if lv["console"] == "1":
-		subprocess.run([lv["java"]] + args,check = True)
+		proc = subprocess.Popen([lv["java"]] + args)
+		rtn = proc.wait()
+		if rtn != 0: raise Exception("process","return code isn't 0")
 	else:
 		pkwargs = {
 			"stdout": subprocess.DEVNULL,
 			"stdin": subprocess.DEVNULL,
 			"stderr": subprocess.DEVNULL,
-			"close_fds": True
 		}
 		if lv["osName"] == "windows": pkwargs["creationflags"] = 0x00000008
 		subprocess.Popen([lv["java"] + "w"] + args,**pkwargs)