diff --git a/femmt/functions.py b/femmt/functions.py
index 0d1b512d..28d0dab2 100644
--- a/femmt/functions.py
+++ b/femmt/functions.py
@@ -1,13 +1,14 @@
 """Contains different functions, used by the whole FEMMT functions."""
 # Python standard libraries
 import json
-import pkg_resources
 import subprocess
 import sys
 import os
 import warnings
 from scipy.integrate import quad
 import logging
+import importlib.metadata
+
 # Third parry libraries
 import gmsh
 from matplotlib import pyplot as plt
@@ -18,7 +19,6 @@
 import schemdraw
 import schemdraw.elements as elm
 
-
 # Local libraries
 from femmt.constants import *
 from femmt.enumerations import ConductorType
@@ -845,11 +845,20 @@ def pm_core_inner_diameter_calculator(inner_core_diameter: float, hole_diameter:
 
     return np.around(2 * np.sqrt(area_total / np.pi), decimals=4)
 
+def list_installed_packages() -> set:
+    """"List installed python packages."""
+    distributions = importlib.metadata.distributions()
+    installed_packages = []
+    for dist in distributions:
+        args = dist.metadata['Name']
+        installed_packages.append(args)
+    set_installed_packages = set(installed_packages)
+    return set_installed_packages
 
 def install_pyfemm_if_missing() -> None:
     """Installs femm-software pip package in case of running on Windows machine. Windows users only."""
     required = {'pyfemm'}
-    installed = {pkg.key for pkg in pkg_resources.working_set}
+    installed = list_installed_packages()
     missing = required - installed
 
     if missing:
diff --git a/tests/integration/fixtures/log_inductor_core_material_database.json b/tests/integration/fixtures/log_inductor_core_material_database.json
index f3048e37..9b750677 100644
--- a/tests/integration/fixtures/log_inductor_core_material_database.json
+++ b/tests/integration/fixtures/log_inductor_core_material_database.json
@@ -4,87 +4,87 @@
       "f": 100000,
       "winding1": {
         "turn_losses": [
-          0.08186750219758603,
-          0.07855828152724643,
-          0.05047467240452998,
-          0.02103762007713824,
-          0.009397893298164508,
-          0.02103111578873332,
-          0.05067410450942035,
-          0.07945969275407563,
-          0.08423323302123231
+          0.0818675022071684,
+          0.07855828153616791,
+          0.05047467240932421,
+          0.02103762007805146,
+          0.009397893297526803,
+          0.02103111578955079,
+          0.05067410451406756,
+          0.0794596927629429,
+          0.08423323303106273
         ],
         "flux": [
-          9.432469475968289e-05,
-          -4.564864467214203e-07
+          9.432469476716475e-05,
+          -4.564865668072955e-07
         ],
         "flux_over_current": [
-          2.0961010508070005e-05,
-          -1.0490246158232937e-07
+          2.0961010509732907e-05,
+          -1.0490248826801675e-07
         ],
         "V": [
-          0.2966047223854783,
-          59.26586096157406
+          0.2966047978374818,
+          59.26586096627581
         ],
         "number_turns": 9,
         "I": [
           4.5,
           0.0
         ],
-        "winding_losses": 0.4767341155781262,
-        "P": 0.6673606253673262,
-        "Q": 133.34818716354164,
-        "S": 133.34985710531237
+        "winding_losses": 0.4767341156258626,
+        "P": 0.667360795134334,
+        "Q": 133.34818717412057,
+        "S": 133.34985711674076
       },
-      "core_eddy_losses": 0.005277688833746474,
-      "core_hyst_losses": 0.186036315606035,
+      "core_eddy_losses": 0.005277688833992931,
+      "core_hyst_losses": 0.1860364851277851,
       "core_parts": {
         "core_part_1": {
-          "eddy_losses": 0.002182820518385057,
-          "hyst_losses": 0.1295468431448242,
-          "total_core_part_1": 0.13172966366320926
+          "eddy_losses": 0.002182820518597349,
+          "hyst_losses": 0.1295469635607354,
+          "total_core_part_1": 0.13172978407933275
         },
         "core_part_2": {
-          "eddy_losses": 0.003094868315361419,
-          "hyst_losses": 0.05648947246121275,
-          "total_core_part_2": 0.059584340776574166
+          "eddy_losses": 0.003094868315395592,
+          "hyst_losses": 0.05648952156704907,
+          "total_core_part_2": 0.05958438988244466
         }
       },
-      "all_winding_losses": 0.4767341155781262
+      "all_winding_losses": 0.4767341156258626
     }
   ],
   "total_losses": {
     "winding1": {
-      "total": 0.47673411557812684,
+      "total": 0.47673411562586276,
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+        0.0818675022071684,
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+        0.02103762007805146,
+        0.009397893297526803,
+        0.02103111578955079,
+        0.05067410451406756,
+        0.0794596927629429,
+        0.08423323303106273
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-    "all_windings": 0.4767341155781262,
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-    "hyst_core_fundamental_freq": 0.186036315606035,
-    "total_core_part_1": 0.13172966366320926,
-    "total_eddy_core_part_1": 0.002182820518385057,
-    "total_hyst_core_part_1": 0.1295468431448242,
-    "total_core_part_2": 0.059584340776574166,
-    "total_eddy_core_part_2": 0.003094868315361419,
-    "total_hyst_core_part_2": 0.05648947246121275,
-    "core": 0.19131400443978147,
-    "total_losses": 0.6680481200179077
+    "all_windings": 0.4767341156258626,
+    "eddy_core": 0.005277688833992931,
+    "hyst_core_fundamental_freq": 0.1860364851277851,
+    "total_core_part_1": 0.13172978407933275,
+    "total_eddy_core_part_1": 0.002182820518597349,
+    "total_hyst_core_part_1": 0.1295469635607354,
+    "total_core_part_2": 0.05958438988244466,
+    "total_eddy_core_part_2": 0.003094868315395592,
+    "total_hyst_core_part_2": 0.05648952156704907,
+    "core": 0.19131417396177802,
+    "total_losses": 0.6680482895876406
   },
   "simulation_settings": {
     "simulation_name": null,
-    "date": "2025-08-20 10:20:18",
+    "date": "2026-03-05 12:59:55",
     "component_type": "Inductor",
-    "working_directory": "C:\\Users\\tpiepe\\Repositories\\FEM_Magnetics_Toolbox\\tests\\integration\\temp",
+    "working_directory": "/home/nikolasf/Dokumente/01_git/30_Python/FEMMT/tests/integration/temp",
     "core": {
       "core_type": 1,
       "core_inner_diameter": 0.0149,
@@ -193,4 +193,4 @@
     ],
     "total_cost_incl_margin": 5.471883844584376
   }
-}
\ No newline at end of file
+}
diff --git a/tests/integration/fixtures/log_transformer_5_windings.json b/tests/integration/fixtures/log_transformer_5_windings.json
index 47a145d4..c17ef78f 100644
--- a/tests/integration/fixtures/log_transformer_5_windings.json
+++ b/tests/integration/fixtures/log_transformer_5_windings.json
@@ -4,255 +4,255 @@
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     "simulation_name": null,
-    "date": "2025-08-20 10:06:21",
+    "date": "2026-03-05 13:01:01",
     "component_type": "Transformer",
-    "working_directory": "C:\\Users\\tpiepe\\Repositories\\FEM_Magnetics_Toolbox\\tests\\integration\\temp",
+    "working_directory": "/home/nikolasf/Dokumente/01_git/30_Python/FEMMT/tests/integration/temp",
     "core": {
       "core_type": 1,
       "core_inner_diameter": 0.012,
@@ -547,4 +547,4 @@
     ],
     "total_cost_incl_margin": 20.773745545974702
   }
-}
\ No newline at end of file
+}
diff --git a/tests/integration/fixtures/material_inductor_core_material_database.json b/tests/integration/fixtures/material_inductor_core_material_database.json
index e5713450..65a079f7 100644
--- a/tests/integration/fixtures/material_inductor_core_material_database.json
+++ b/tests/integration/fixtures/material_inductor_core_material_database.json
@@ -105,208 +105,208 @@
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+}
diff --git a/tests/integration/fixtures/material_transformer_5_windings.json b/tests/integration/fixtures/material_transformer_5_windings.json
index 2de9ebb1..e20cbc01 100644
--- a/tests/integration/fixtures/material_transformer_5_windings.json
+++ b/tests/integration/fixtures/material_transformer_5_windings.json
@@ -1,7 +1,7 @@
 {
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+}
diff --git a/tests/integration/fixtures/thermal_transformer_5_windings.json b/tests/integration/fixtures/thermal_transformer_5_windings.json
index 8d2c69da..deaa0dc9 100644
--- a/tests/integration/fixtures/thermal_transformer_5_windings.json
+++ b/tests/integration/fixtures/thermal_transformer_5_windings.json
@@ -1,206 +1,206 @@
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@@ -208,8 +208,8 @@
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 }