diff --git a/internal/releasesjson/downloader.go b/internal/releasesjson/downloader.go
index b50fea0..2f937f1 100644
--- a/internal/releasesjson/downloader.go
+++ b/internal/releasesjson/downloader.go
@@ -64,23 +64,9 @@ func (d *Downloader) DownloadAndUnpack(ctx context.Context, pv *ProductVersion,
 
 	client := httpclient.NewHTTPClient()
 
-	archiveURL := pb.URL
-	if d.BaseURL != "" {
-		// If custom URL is set, use that instead of the one from the JSON.
-		// Also ensures that absolute download links from mocked responses
-		// are still pointing to the mock server if one is set.
-		baseURL, err := url.Parse(d.BaseURL)
-		if err != nil {
-			return nil, err
-		}
-
-		u, err := url.Parse(archiveURL)
-		if err != nil {
-			return nil, err
-		}
-		u.Scheme = baseURL.Scheme
-		u.Host = baseURL.Host
-		archiveURL = u.String()
+	archiveURL, err := determineArchiveURL(pb.URL, d.BaseURL)
+	if err != nil {
+		return nil, err
 	}
 
 	d.Logger.Printf("downloading archive from %s", archiveURL)
@@ -237,3 +223,28 @@ func isLicenseFile(filename string) bool {
 	}
 	return false
 }
+
+// determineArchiveURL determines the archive URL based on the base URL provided.
+func determineArchiveURL(archiveURL, baseURL string) (string, error) {
+	// If custom URL is set, use that instead of the one from the JSON.
+	// Also ensures that absolute download links from mocked responses
+	// are still pointing to the mock server if one is set.
+	if baseURL == "" {
+		return archiveURL, nil
+	}
+
+	base, err := url.Parse(baseURL)
+	if err != nil {
+		return "", err
+	}
+
+	u, err := url.Parse(archiveURL)
+	if err != nil {
+		return "", err
+	}
+
+	// Use base URL path and append the path from the archive URL.
+	newArchiveURL := base.JoinPath(u.Path)
+
+	return newArchiveURL.String(), nil
+}
diff --git a/internal/releasesjson/downloader_test.go b/internal/releasesjson/downloader_test.go
new file mode 100644
index 0000000..043caf4
--- /dev/null
+++ b/internal/releasesjson/downloader_test.go
@@ -0,0 +1,47 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package releasesjson
+
+import "testing"
+
+func TestDetermineArchiveURL(t *testing.T) {
+	tests := []struct {
+		name       string
+		archiveURL string
+		baseURL    string
+		want       string
+	}{
+		{
+			name:       "with custom base URL + path",
+			archiveURL: "https://releases.hashicorp.com/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+			baseURL:    "https://myartifactory.company.com/artifactory/hashicorp-remote",
+			want:       "https://myartifactory.company.com/artifactory/hashicorp-remote/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+		},
+		{
+			name:       "with custom base URL + port + path",
+			archiveURL: "https://releases.hashicorp.com/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+			baseURL:    "https://myartifactory.company.com:443/artifactory/hashicorp-remote",
+			want:       "https://myartifactory.company.com:443/artifactory/hashicorp-remote/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+		},
+		{
+			name:       "without custom base URL",
+			archiveURL: "https://releases.hashicorp.com/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+			baseURL:    "",
+			want:       "https://releases.hashicorp.com/terraform/1.8.2/terraform_1.8.2_darwin_amd64.zip",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := determineArchiveURL(tt.archiveURL, tt.baseURL)
+			if err != nil {
+				t.Errorf("determineArchiveURL() error = %v", err)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("determineArchiveURL() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}