diff --git a/README.md b/README.md
index 3bf3a93..9bca645 100644
--- a/README.md
+++ b/README.md
@@ -145,17 +145,18 @@ cat ~/.config/inkscape/extensions/mightyscape-1.2/requirements.txt | sed '/^#/d'
 : %AppData%\..\Local\Programs\Python\Python313\Scripts
 : The python executable should be available with command "py" (or "python" or "python.exe")
 
-: we also install and upgrade pip package manager, if not already done
-py -m ensurepip --upgrade
-py -m pip install --upgrade pip
-
 py -m venv %AppData%\inkscape\extensions\mightyscape-1.2\venv
 
 : then we clone MightyScape project into extension directory
 cd %AppData%\inkscape\extensions\
 git clone https://gitea.fablabchemnitz.de/FabLab_Chemnitz/mightyscape-1.2.git
 
-%AppData%\inkscape\extensions\mightyscape-1.2\venv\python3 -m pip install --upgrade --quiet --no-cache-dir -r %AppData%\inkscape\extensions\mightyscape-1.2\requirements.txt
+: we also install and upgrade pip package manager, if not already done
+%AppData%\inkscape\extensions\mightyscape-1.2\venv\Scripts\python.exe -m ensurepip --upgrade
+%AppData%\inkscape\extensions\mightyscape-1.2\venv\Scripts\python.exe -m pip install --upgrade pip
+
+: install modules
+%AppData%\inkscape\extensions\mightyscape-1.2\venv\Scripts\python.exe -m pip install --upgrade --quiet --no-cache-dir -r %AppData%\inkscape\extensions\mightyscape-1.2\requirements.txt
 
 : use this in case the previous command failed to continue by just skipping errors (less clean installation)
 cd %AppData%\inkscape\extensions\mightyscape-1.2\
diff --git a/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.inx b/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.inx
index c9b5642..048121c 100644
--- a/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.inx
+++ b/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.inx
@@ -19,7 +19,7 @@
             </page>
             <page name="tab_about" gui-text="About">
                 <label appearance="header">MightyScape Extension Collection</label>
-                <label>2019 - 2024 / written by Mario Voigt (Stadtfabrikanten e.V. / FabLab Chemnitz)</label>
+                <label>2019 - 2025 / written by Mario Voigt (Stadtfabrikanten e.V. / FabLab Chemnitz)</label>
                 <spacer />
                 <label appearance="header">Online Documentation</label>
                 <label appearance="url">https://y.stadtfabrikanten.org/mightyscape-overview</label>
diff --git a/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.py b/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.py
index e127be4..f2207f7 100644
--- a/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.py
+++ b/extensions/fablabchemnitz/about_upgrade_mightyscape/about_upgrade_mightyscape.py
@@ -32,7 +32,7 @@ class AboutUpgradeMightyScape(inkex.EffectExtension):
     restart = False
 
     def install_requirements(self):
-        requirements = inkex.utils.debug(os.path.abspath(os.path.join(self.ext_path()) + "/../../../requirements.txt"))
+        requirements = os.path.abspath(os.path.join(self.ext_path()) + "/../../../requirements.txt")
         if not os.path.exists(requirements):
             inkex.utils.debug("requirements.txt could not be found.")
             exit(1)
@@ -41,13 +41,16 @@ class AboutUpgradeMightyScape(inkex.EffectExtension):
             python_venv = os.path.abspath(os.path.join(os.path.dirname(git.__file__), '../', '../', '../', '../', 'venv', 'Scripts', 'python.exe'))
         else: #Linux/MacOS
             python_venv = os.path.abspath(os.path.join(os.path.dirname(git.__file__), '../', '../', '../', '../', 'bin', 'python'))
-
-        command = ["{} -m pip install --upgrade --quiet --no-cache-dir -r ".format(python_venv) + requirements]
-        inkex.utils.debug("Executing: {}".format(command[0]))
-        proc = subprocess.Popen(command, shell=True, stdout=PIPE, stderr=PIPE)
+        command = "{} -m pip install --upgrade --no-cache-dir -r {}".format(python_venv, requirements)
+        inkex.utils.debug("Executing: {}".format(command))
+        proc = subprocess.Popen(command, shell=True, stdout=PIPE, stderr=PIPE, encoding="UTF-8")
         stdout, stderr = proc.communicate()
-        inkex.utils.debug(stdout.decode('UTF-8'))
-        inkex.utils.debug(stderr.decode('UTF-8'))
+        try:
+            inkex.utils.debug(stdout)
+            inkex.utils.debug(stderr)
+        except:
+            pass
+        
         proc.wait()
 
     def update(self, local_repo, remote, localCommitCount):
diff --git a/extensions/fablabchemnitz/boxes.py/boxes_proxy.py b/extensions/fablabchemnitz/boxes.py/boxes_proxy.py
index 3c711fd..9a107e2 100644
--- a/extensions/fablabchemnitz/boxes.py/boxes_proxy.py
+++ b/extensions/fablabchemnitz/boxes.py/boxes_proxy.py
@@ -95,7 +95,7 @@ class boxesPyWrapper(inkex.GenerateExtension):
         stdout, stderr = proc.communicate()
         if stderr.decode('utf-8') != "":
             inkex.utils.debug("stderr: {}".format(stderr.decode('utf-8')))
-            exit(1)
+            sys.exit(1)
         
         # check output existence
         try:
@@ -103,7 +103,7 @@ class boxesPyWrapper(inkex.GenerateExtension):
         except FileNotFoundError as e:
             inkex.utils.debug("There was no " + box_file + " output generated. Cannot continue. Command was:")
             inkex.utils.debug(str(cmd))
-            exit(1)
+            sys.exit(1)
             
         # write the generated SVG into Inkscape's canvas
         p = etree.XMLParser(huge_tree=True)