Let's try

Author: dcamron

.github/actions/install-pypi/action.yml

@@ -56,18 +56,25 @@ runs:
           echo "DEP_GROUPS=${{ inputs.type }}" >> $GITHUB_ENV
         fi
 
+    - name: Set install flags
+      shell: bash
+      run: echo "INSTALL_FLAGS=${{ env.INSTALL_FLAGS }}" >> $GITHUB_ENV
+
+    - name: Massage for backwards compatibility
+      if: ${{ inputs.version-file && (inputs.install-flags == '') }}
+      shell: bash
+      run: echo "INSTALL_FLAGS=-c ci/${{ inputs.version-file }} -c ci-dev/${{ inputs.type }}_requirements.txt -c ci/extra_requirements.txt" >> $GITHUB_ENV
+
     - name: Install
       shell: bash
       run: >
-        uv pip install --system ${{ inputs.install-flags }} ${{ inputs.install-target }}[${{ env.DEP_GROUPS }}]
-        -c ci/${{ inputs.version-file }} -c ci-dev/${{ inputs.type }}_requirements.txt -c ci/extra_requirements.txt
+        uv pip install --system ${{ env.INSTALL_FLAGS }} ${{ inputs.install-target }}[${{ env.DEP_GROUPS }}]
 
     - name: Install additional test tools
       if: ${{ inputs.type == 'test' }}
       shell: bash
       run: >
-        uv pip install --system coverage
-        -c ci/${{ inputs.version-file }} -c ci-dev/${{ inputs.type }}_requirements.txt -c ci/extra_requirements.txt
+        uv pip install --system $${{ env.INSTALL_FLAGS }} coverage
 
     - name: Download Cartopy Maps
       if: ${{ inputs.need-cartopy == 'true' }}

.github/workflows/ci.yml

@@ -53,11 +53,17 @@ jobs:
         persist-credentials: false
 
     - uses: actions/download-artifact@v8
+      with:
+        name: wheels-${{ matrix.platform }}
 
     - name: Set flag to install minimum dependencies
       if: ${{ matrix.dep-versions == 'Minimum' }}
       run: echo "INSTALL_FLAGS=${{ env.INSTALL_FLAGS }} --resolution=lowest-direct" >> $GITHUB_ENV
 
+    - name: Set flag to constrain CI dependencies
+      if: ${{ matrix.dep-versions == 'Latest' }}
+      run: echo "INSTALL_FLAGS=${{ env.INSTALL_FLAGS }} -c ci/requirements.txt -c ci-dev/${{ inputs.type }}_requirements.txt -c ci/extra_requirements.txt" >> $GITHUB_ENV
+
     - name: Install from PyPI
       uses: ./.github/actions/install-pypi
       with: