diff --git a/beta/setup_libroadrunner.py b/beta/setup_libroadrunner.py
index e91bb3cd2..4f3156b8b 100644
--- a/beta/setup_libroadrunner.py
+++ b/beta/setup_libroadrunner.py
@@ -27,7 +27,6 @@ def reminder_dynamic_link_path_linux():
     print("\n*      To make this permanent, add this line to the bottom of the respective shell startup file, e.g., .bashrc, .bash_profile, or .zshenv in your home directory.")
     print("\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n")
 
-# print("--------- print reminder!!!!!!!!!!!!!!\n\n")
 if os.path.exists(os.path.join(os.path.dirname(os.path.dirname(__file__)), "addons", "libRoadrunner", "roadrunner")):
     print('\nlibroadrunner already installed.\n')
 
@@ -40,22 +39,19 @@ def reminder_dynamic_link_path_linux():
     rr_file = ""
     url = ""
 
+    mac_silicon = False
     if os_type.lower() == 'darwin':
         reminder_dynamic_link_path_macos()
         if "ARM64" in platform.uname().version:
             # pass
-            # reminder_dynamic_link_path()
             # print('... for the arm64 processor.')
             # url = "https://github.com/PhysiCell-Tools/intracellular_libs/raw/main/ode/libs/macos12_arm64/libroadrunner_c_api.dylib"
             rr_file = "roadrunner_macos_arm64.tar.gz"
             url = "https://github.com/PhysiCell-Tools/intracellular_libs/raw/main/ode/roadrunner_macos_arm64.tar.gz"
+            mac_silicon = True
         else:
             rr_file = "roadrunner-osx-10.9-cp36m.tar.gz"
             url = "https://sourceforge.net/projects/libroadrunner/files/libroadrunner-1.4.18/" + rr_file + "/download"
-            # url = "https://raw.github.com/PhysiCell-Tools/intracellular_libs/blob/main/ode/libs/macos/roadrunner-osx-10.9-cp36m.tar.gz"
-
-            # rr_file = "roadrunner-osx-10.9-cp36m.tar.gz"
-            # url = "https://github.com/PhysiCell-Tools/intracellular_libs/raw/main/ode/libs/macos/roadrunner-osx-10.9-cp36m.tar.gz"
     elif os_type.lower().startswith("win"):
         rr_file = "roadrunner-win64-vs14-cp35m.zip"
         url = "https://sourceforge.net/projects/libroadrunner/files/libroadrunner-1.4.18/" + rr_file + "/download"
@@ -67,11 +63,12 @@ def reminder_dynamic_link_path_linux():
         print("Your operating system seems to be unsupported. Please submit a ticket at https://sourceforge.net/p/physicell/tickets/ ")
         sys.exit(1)
 
-    # print("-------- past if block...")
-    # reminder_dynamic_link_path()
-    # fname = url.split('/')[-2]
-    fname = url.split('/')[-1]
-    print("fname = ",fname)
+    print("url=",url)
+    if mac_silicon:
+        fname = url.split('/')[-1]
+    else:
+        fname = url.split('/')[-2]
+    print("fname=",fname)
 
     # home = os.path.expanduser("~")
     print('libRoadRunner will now be installed into this location:')
@@ -115,8 +112,13 @@ def reminder_dynamic_link_path_linux():
     if os_type.lower().startswith("win"):
         rrlib_dir = my_file[:-4]
     else:  # darwin or linux
-        rrlib_dir = my_file[:-7]
-        rrlib_dir = my_file[:-6]
+        if mac_silicon:
+            # idx_end = my_file.rindex('/')
+            # rrlib_dir = my_file[:idx_end]
+            rrlib_dir = my_file[:-7]
+            # rrlib_dir = my_file
+        else:
+            rrlib_dir = my_file[:-7]
     print('rrlib_dir = ',rrlib_dir)
 
     def download_cb(blocknum, blocksize, totalsize):
@@ -133,12 +135,10 @@ def download_cb(blocknum, blocksize, totalsize):
 
     urllib.request.urlretrieve(url, my_file, download_cb)
 
-    # sys.exit(-1)
-
     new_dir_name = "roadrunner"
     os.chdir(dir_name)
     print('installing (uncompressing) the file...')
-    if os_type.lower().startswith("win"):   # on Windows
+    if os_type.lower().startswith("win"):
         try:
             with zipfile.ZipFile(rr_file) as zf:
                 zf.extractall('.')
@@ -148,23 +148,24 @@ def download_cb(blocknum, blocksize, totalsize):
             exit(1)
     else:  # Darwin or Linux
         try:
-            print("-- attempt to extract from the tar file...", rr_file)
+            print("untarring ",rr_file)
             tar = tarfile.open(rr_file)
             tar.extractall()
             tar.close()
             if 'darwin' in os_type.lower():
-                if "ARM64" in platform.uname().version:   # on the new Mac M1, arm64 processor
-                # if False:
-                #     print("--- TODO: rename ARM64 lib dir")
-                #     sys.exit(-1)
-                    pass  # it already uncompresses and creates the 'roadrunner' dir
+                if mac_silicon:
+                    os.rename("roadrunner_macos_arm64", new_dir_name)
                 else:
                     os.rename("roadrunner-osx-10.9-cp36m", new_dir_name)
             else:
                 os.rename("libroadrunner", new_dir_name)
         except:
-            print('error untarring the file')
-            exit(1)
+            if mac_silicon:
+                print()
+                # pass
+            else:
+                print('error untarring the file')
+                exit(1)
 
     print('Done.\n')