Revert "install EA into runner"

This reverts commit 53bf108.

Author: laszloItemis

.github/workflows/AddIn-build.yml

@@ -73,11 +73,6 @@ jobs:
     - name: Setup MSBuild.exe
       uses: microsoft/setup-msbuild@v2
 
-    - name: Install Enterprise Architect
-      run: |
-        curl -L -o EA.msi "https://sparxsystems.com/bin/ea_demo.msi"
-        msiexec /i EA.msi /quiet /norestart
-
     # Execute all unit tests in the solution
     #- name: Execute unit tests
     #  run: dotnet test