Official source : nochtofficial.wordpress.com/bless-download-install-guide/
Bless Online Rebuild Test Server Download & Installation Guide
Get an Account
Step 1. Get a South Korean Social Security Number, so be a S. Korean citizen or know a friend from S. Korea who will let you use his SSN. Oh, you will also need a S. Korean phone number to confirm your residency.
Step 2. Register here: account.pmang.com/SignUp_account
*Alternatively, you can buy an account from websites. Just search for “Bless account”.
Download and Install
Step 1. Go to the download page: bless.pmang.com/rebuild/index.nwz
Click the button on the right:
Step 2. A confirmation will pop up. Click to Open Pmang Game Launcher.
There may be another Windows pop-up asking for confirmation to run the Pmang Launcher.
Step 3. The Pmang icon will appear in your system tray.
Step 4. Shortly after the icon appears, a EULA agreement window will pop up. Check the box then click the red button to confirm your agreement to the EULA.
Step 5. A window will pop up for specifying download location.
Step 6. The test client will start downloading.
Launching The Test Client
Step 1. Have VPN activated with a South Korean IP address.
Step 2. Log in to your account: secure.pmang.com/plogin.nwz
Step 3. Click on the right launcher labeled “Beta” on the Pmang main page.
Step 4. You will be redirected to the page show below. Click on the big red button.
Step 5. You can disconnect the VPN when the splash screen is up. It does not need to be fully loaded.
all credit to @Nocht
VPN: 02:10 - 03:00 min
Bless Online Rebuild Test Server Download & Installation Guide
Get an Account
Step 1. Get a South Korean Social Security Number, so be a S. Korean citizen or know a friend from S. Korea who will let you use his SSN. Oh, you will also need a S. Korean phone number to confirm your residency.
Step 2. Register here: account.pmang.com/SignUp_account
*Alternatively, you can buy an account from websites. Just search for “Bless account”.
Download and Install
Step 1. Go to the download page: bless.pmang.com/rebuild/index.nwz
Click the button on the right:
Step 2. A confirmation will pop up. Click to Open Pmang Game Launcher.
There may be another Windows pop-up asking for confirmation to run the Pmang Launcher.
Step 3. The Pmang icon will appear in your system tray.
Step 4. Shortly after the icon appears, a EULA agreement window will pop up. Check the box then click the red button to confirm your agreement to the EULA.
Step 5. A window will pop up for specifying download location.
Step 6. The test client will start downloading.
Launching The Test Client
Step 1. Have VPN activated with a South Korean IP address.
Step 2. Log in to your account: secure.pmang.com/plogin.nwz
Step 3. Click on the right launcher labeled “Beta” on the Pmang main page.
Step 4. You will be redirected to the page show below. Click on the big red button.
Step 5. You can disconnect the VPN when the splash screen is up. It does not need to be fully loaded.
all credit to @Nocht
VPN: 02:10 - 03:00 min