diff --git a/.github/workflows/manual_verify_install.yml b/.github/workflows/manual_verify_install.yml
new file mode 100644
index 0000000..989f833
--- /dev/null
+++ b/.github/workflows/manual_verify_install.yml
@@ -0,0 +1,35 @@
+name: Manual Verify Installation
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Specific version to install (optional, defaults to latest)'
+        required: false
+        default: ''
+
+jobs:
+  verify-pypi-install:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.13"]
+    steps:
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install PyOctaveBand
+        run: |
+          python -m pip install --upgrade pip
+          if [ -z "${{ inputs.version }}" ]; then
+            pip install pyoctaveband
+          else
+            pip install pyoctaveband==${{ inputs.version }}
+          fi
+        shell: bash
+
+      - name: Verify Import
+        run: python -c "import pyoctaveband; print('Successfully imported pyoctaveband version:', pyoctaveband.__version__)"
diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index c41425f..a0b1f4b 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -36,12 +36,14 @@ jobs:
       run: bandit -r src
 
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     permissions:
       contents: read
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12", "3.13"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.13"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
@@ -54,18 +56,18 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r requirements.txt
         pip install -r requirements-dev.txt
-        pip install -e .
+        pip install .
     - name: Run tests
       env:
         NUMBA_DISABLE_JIT: 1
       run: |
-        pytest --junitxml=test-results-${{ matrix.python-version }}.xml --cov=src --cov-report=xml
+        pytest --junitxml=test-results-${{ matrix.os }}-${{ matrix.python-version }}.xml --cov=src --cov-report=xml
     - name: Upload Test Results
       uses: actions/upload-artifact@v4
       with:
-        name: test-results-${{ matrix.python-version }}
+        name: test-results-${{ matrix.os }}-${{ matrix.python-version }}
         path: |
-          test-results-${{ matrix.python-version }}.xml
+          test-results-${{ matrix.os }}-${{ matrix.python-version }}.xml
           coverage.xml
       if: always()
 
@@ -80,7 +82,7 @@ jobs:
     - name: Download coverage report
       uses: actions/download-artifact@v4
       with:
-        name: test-results-3.13
+        name: test-results-ubuntu-latest-3.13
     - name: SonarCloud Scan
       uses: SonarSource/sonarqube-scan-action@master
       env: