diff --git a/packages/artifact/src/internal/client.ts b/packages/artifact/src/internal/client.ts
index 45ba0bfe..921d5faa 100644
--- a/packages/artifact/src/internal/client.ts
+++ b/packages/artifact/src/internal/client.ts
@@ -17,6 +17,7 @@ import {
 } from './download/download-artifact'
 import {getArtifactPublic, getArtifactInternal} from './find/get-artifact'
 import {listArtifactsPublic, listArtifactsInternal} from './find/list-artifacts'
+import {GHESNotSupportError} from './shared/errors'
 
 export interface ArtifactClient {
   /**
@@ -52,6 +53,7 @@ export interface ArtifactClient {
   /**
    * Finds an artifact by name.
    * If there are multiple artifacts with the same name in the same workflow run, this will return the latest.
+   * If the artifact is not found, it will throw.
    *
    * If options.findBy is specified, this will use the public List Artifacts API with a name filter which can get artifacts from other runs.
    * https://docs.github.com/en/rest/actions/artifacts?apiVersion=2022-11-28#list-workflow-run-artifacts
@@ -99,16 +101,11 @@ export class Client implements ArtifactClient {
     rootDirectory: string,
     options?: UploadArtifactOptions
   ): Promise<UploadArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and upload-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportError()
+      }
+
       return uploadArtifact(name, files, rootDirectory, options)
     } catch (error) {
       warning(
@@ -118,9 +115,8 @@ Errors can be temporary, so please try again and optionally run the action with
 
 If the error persists, please check whether Actions is operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
-      return {
-        success: false
-      }
+
+      throw error
     }
   }
 
@@ -131,16 +127,11 @@ If the error persists, please check whether Actions is operating normally at [ht
     artifactId: number,
     options?: DownloadArtifactOptions & FindOptions
   ): Promise<DownloadArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {repositoryOwner, repositoryName, token},
@@ -159,16 +150,14 @@ If the error persists, please check whether Actions is operating normally at [ht
       return downloadArtifactInternal(artifactId, options)
     } catch (error) {
       warning(
-        `Artifact download failed with error: ${error}.
+        `Download Artifact failed with error: ${error}.
 
 Errors can be temporary, so please try again and optionally run the action with debug mode enabled for more information.
 
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
 
-      return {
-        success: false
-      }
+      throw error
     }
   }
 
@@ -178,16 +167,11 @@ If the error persists, please check whether Actions and API requests are operati
   async listArtifacts(
     options?: ListArtifactsOptions & FindOptions
   ): Promise<ListArtifactsResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        artifacts: []
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {workflowRunId, repositoryOwner, repositoryName, token}
@@ -212,9 +196,7 @@ Errors can be temporary, so please try again and optionally run the action with
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
 
-      return {
-        artifacts: []
-      }
+      throw error
     }
   }
 
@@ -225,16 +207,11 @@ If the error persists, please check whether Actions and API requests are operati
     artifactName: string,
     options?: FindOptions
   ): Promise<GetArtifactResponse> {
-    if (isGhes()) {
-      warning(
-        `@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.`
-      )
-      return {
-        success: false
-      }
-    }
-
     try {
+      if (isGhes()) {
+        throw new GHESNotSupportError()
+      }
+
       if (options?.findBy) {
         const {
           findBy: {workflowRunId, repositoryOwner, repositoryName, token}
@@ -252,15 +229,13 @@ If the error persists, please check whether Actions and API requests are operati
       return getArtifactInternal(artifactName)
     } catch (error: unknown) {
       warning(
-        `Fetching Artifact failed with error: ${error}.
+        `Get Artifact failed with error: ${error}.
 
 Errors can be temporary, so please try again and optionally run the action with debug mode enabled for more information.
 
 If the error persists, please check whether Actions and API requests are operating normally at [https://githubstatus.com](https://www.githubstatus.com).`
       )
-      return {
-        success: false
-      }
+      throw error
     }
   }
 }
diff --git a/packages/artifact/src/internal/shared/errors.ts b/packages/artifact/src/internal/shared/errors.ts
index 7ca33bdb..71e8e304 100644
--- a/packages/artifact/src/internal/shared/errors.ts
+++ b/packages/artifact/src/internal/shared/errors.ts
@@ -26,3 +26,12 @@ export class ArtifactNotFoundError extends Error {
     this.name = 'ArtifactNotFoundError'
   }
 }
+
+export class GHESNotSupportError extends Error {
+  constructor(
+    message = '@actions/artifact v2.0.0+ and download-artifact@v4+ are not currently supported on GHES.'
+  ) {
+    super(message)
+    this.name = 'NotSupportedGHESError'
+  }
+}
diff --git a/packages/artifact/src/internal/shared/interfaces.ts b/packages/artifact/src/internal/shared/interfaces.ts
index a8a6daa7..dfd3e1da 100644
--- a/packages/artifact/src/internal/shared/interfaces.ts
+++ b/packages/artifact/src/internal/shared/interfaces.ts
@@ -56,7 +56,7 @@ export interface GetArtifactResponse {
   /**
    * Metadata about the artifact that was found
    */
-  artifact?: Artifact
+  artifact: Artifact
 }
 
 /*****************************************************************************