How to Download, Install, and Activate SQL Server 2025 (2026 Guide)

Installing SQL Server 2025 takes about 30-45 minutes if you have your license key and installation media ready before you start. This guide walks through the full process, from download to first successful login, for both Standard and Enterprise editions.

If you haven’t decided which edition or licensing model you need yet, see our SQL Server 2025 licensing guide first, it’s worth getting the licensing decision right before you install.

Before You Start

Windows Server host: SQL Server 2025 requires Windows Server 2022 or 2025 as the host operating system. Check our Windows Server 2025 hardware requirements to confirm your server meets the minimums.

• Product key: Have your genuine SQL Server 2025 license key ready, you’ll need it during setup.
• Administrator access: You’ll need local administrator rights on the server you’re installing to.
• A service account: Decide in advance whether SQL Server services will run under a domain account, a local account, or a managed service account. This is easier to set correctly during install than to change afterward.

Step 1: Download the Installation Media

Download the SQL Server 2025 installer (setup.exe) matching your edition and delivery method. If you purchased an electronic delivery license, your download link and product key arrive together in your order confirmation.

Step 2: Run the SQL Server Installation Center

1. Run setup.exe as Administrator.
2. In the SQL Server Installation Center, select Installation from the left menu, then New SQL Server stand-alone installation.
3. Accept the license terms and enter your product key when prompted.

Step 3: Choose Features to Install

The Feature Selection screen lets you pick which components to install. At minimum, most installations need:

• Database Engine Services
• SQL Server Replication (if you’ll use replication later)
• Full-Text and Semantic Extractions for Search (if you need text search)

Avoid installing features you won’t use, each added component increases the server’s patching and security surface for no benefit.

Step 4: Configure the Instance

1. Choose between a Default instance or a Named instance. Most single-SQL-Server environments use the default instance unless you’re planning to run multiple SQL Server versions or instances on the same machine.
2. Set the Instance ID, this becomes part of the installation path and registry keys.

Step 5: Set Up Service Accounts

Assign the service account you decided on before starting. For production environments, a dedicated domain service account (not a personal admin account) is the recommended practice, it keeps SQL Server’s permissions isolated and makes auditing straightforward.

Step 6: Configure Database Engine Settings

1. Authentication Mode: Choose Windows Authentication Mode, or Mixed Mode if you need SQL Server logins in addition to Windows accounts. Mixed Mode requires you to set an account password during this step, use a strong, unique password.
2. SQL Server Administrators: Add the Windows accounts or groups that need administrative access to this instance.

Step 7: Complete Installation

Review the summary screen, then click Install. Installation typically takes 15-30 minutes depending on the features selected and server hardware.

Step 8: Activate SQL Server

If you entered your product key during Step 2, SQL Server activates automatically during installation. To verify activation succeeded:

1. Open SQL Server Management Studio (SSMS) if installed, or connect via sqlcmd.
2. Run: SELECT SERVERPROPERTY(‘Edition’), SERVERPROPERTY(‘ProductVersion’), SERVERPROPERTY(‘LicenseType’)
3. Confirm the edition and license type match your purchase.

If you installed using the free evaluation edition and need to convert to a licensed edition afterward, run the installer again and select Edition Upgrade from the Maintenance menu, entering your product key at that point.

Step 9: Verify the Installation

1. Open SQL Server Configuration Manager and confirm the SQL Server service is running.
2. Connect via “SSMS” or “sqlcmd” using the credentials configured in Step 6.
3. Run a basic test query to confirm the Database Engine is responding correctly.

Common Installation Issues

Setup fails at the prerequisites check: Usually means a missing .NET Framework version or a pending Windows restart. Install the required .NET version and restart before retrying.

Product key rejected during setup: Confirm the key matches the edition you selected in Feature Selection, a Standard key won’t activate an Enterprise installation and vice versa.

Service won’t start after installation: Check the service account has the correct permissions, and review the SQL Server error log (typically in the MSSQL install directory under Log) for the specific failure reason.

Buy Genuine SQL Server 2025 Licenses

Indigo Software sells genuine, perpetual SQL Server 2025 licenses with instant electronic delivery, no subscription required:

• SQL Server 2025 Standard
• SQL Server 2025 Enterprise

Not sure which edition or licensing model fits your setup? Our SQL Server 2025 licensing guide covers Standard vs Enterprise and Per Core vs Server + CAL in detail, or contact us directly.

Frequently Asked Questions