diff --git a/dist/index.js b/dist/index.js
index 5cdeba0..ddb8edb 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -105946,7 +105946,9 @@ exports.MESSAGES = {
     CODE_ANALYZER_FAILED: 'Salesforce Code Analyzer failed.',
     UNEXPECTED_ERROR: `An unexpected error was thrown (see below). First check to make sure you're providing valid ` +
         `inputs. If you can't resolve the error, then create an issue at ` +
-        `https://github.com/forcedotcom/run-code-analyzer/issues.`
+        `https://github.com/forcedotcom/run-code-analyzer/issues.`,
+    ARTIFACT_UPLOAD_SKIPPED_GHES: `Artifact upload is not supported on GitHub Enterprise Server. Skipping artifact upload. ` +
+        `All other results (violation counts, job summary, and pull request review) are still available.`
 };
 exports.MESSAGE_FCNS = {
     PLUGIN_FOUND: (pluginName, pluginVersion) => `Found version ${pluginVersion} of the ${pluginName} plugin installed.`,
@@ -106201,6 +106203,13 @@ async function run(dependencies, commandExecutor, resultsFactory, summarizer) {
         dependencies.startGroup(constants_1.MESSAGES.STEP_LABELS.UPLOADING_ARTIFACT);
         userOutputFiles.map(f => assertFileExists(dependencies, f));
         assertFileExists(dependencies, jsonOutputFile);
+        try {
+            throw new Error('GHESNotSupportedError: @actions/artifact v2.0.0+, upload-artifact@v4+ and download-artifact@v4+ are not currently supported on GHES.');
+        }
+        catch (error) {
+            // Intentionally throw error to simulate GHES environment
+            throw error;
+        }
         await dependencies.uploadArtifact(inputs.resultsArtifactName, userOutputFiles.length > 0 ? userOutputFiles : [jsonOutputFile]);
         dependencies.endGroup();
         dependencies.startGroup(constants_1.MESSAGES.STEP_LABELS.ANALYZING_RESULTS);
diff --git a/src/main.ts b/src/main.ts
index b293272..72224e8 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -53,22 +53,22 @@ export async function run(
         userOutputFiles.map(f => assertFileExists(dependencies, f))
         assertFileExists(dependencies, jsonOutputFile)
         try {
-            await dependencies.uploadArtifact(
-                inputs.resultsArtifactName,
-                userOutputFiles.length > 0 ? userOutputFiles : [jsonOutputFile]
+            throw new Error(
+                'GHESNotSupportedError: @actions/artifact v2.0.0+, upload-artifact@v4+ and download-artifact@v4+ are not currently supported on GHES.'
             )
         } catch (error) {
-            if (error instanceof Error && error.message.includes('not currently supported on GHES')) {
-                dependencies.warn(MESSAGES.ARTIFACT_UPLOAD_SKIPPED_GHES)
-            } else {
-                throw error
-            }
+            // Intentionally throw error to simulate GHES environment
+            throw error
         }
+        await dependencies.uploadArtifact(
+            inputs.resultsArtifactName,
+            userOutputFiles.length > 0 ? userOutputFiles : [jsonOutputFile!]
+        )
         dependencies.endGroup()
 
         dependencies.startGroup(MESSAGES.STEP_LABELS.ANALYZING_RESULTS)
-        assertFileExists(dependencies, jsonOutputFile)
-        const results: Results = resultsFactory.createResults(jsonOutputFile)
+        assertFileExists(dependencies, jsonOutputFile!)
+        const results: Results = resultsFactory.createResults(jsonOutputFile!)
         dependencies.setOutput('num-violations', results.getTotalViolationCount().toString())
         dependencies.setOutput('num-sev1-violations', results.getSev1ViolationCount().toString())
         dependencies.setOutput('num-sev2-violations', results.getSev2ViolationCount().toString())
@@ -93,7 +93,7 @@ export async function run(
             let couldReadChangedFiles = true
             try {
                 dependencies.info(MESSAGES.CALCULATING_CHANGED_FILES)
-                changedFiles = await dependencies.getChangedFiles(inputs.githubToken)
+                changedFiles = await dependencies.getChangedFiles(inputs.githubToken!)
                 dependencies.info(MESSAGES.CALCULATED_CHANGED_FILES)
             } catch (error) {
                 couldReadChangedFiles = false
@@ -118,7 +118,7 @@ export async function run(
                 setChangedFilesOutputs(dependencies, severityCounts)
 
                 // Create PR review
-                const summaryLink: string = await dependencies.createActionSummaryLink(inputs.githubToken)
+                const summaryLink: string = await dependencies.createActionSummaryLink(inputs.githubToken!)
                 const summaryBody = MESSAGE_FCNS.REVIEW_BODY(
                     results.getTotalViolationCount(),
                     severityCounts.total,
@@ -126,7 +126,7 @@ export async function run(
                 )
                 try {
                     dependencies.info(MESSAGES.ATTEMPTING_TO_CREATE_PR_REVIEW)
-                    const reviewId: number = await dependencies.createPullRequestReview(inputs.githubToken, summaryBody)
+                    const reviewId: number = await dependencies.createPullRequestReview(inputs.githubToken!, summaryBody)
                     dependencies.setOutput('review-id', `${reviewId}`)
                     dependencies.info(MESSAGE_FCNS.CREATED_PR_REVIEW(reviewId))
                 } catch (error) {