LANCOM Advanced VPN Client Windows — Upgrade Licence, 1 User
Upgrade licence1 userIPsec IKEv1 / IKEv2Windows 10 / 11
The LANCOM Advanced VPN Client Windows Upgrade (item 61603) is a single-user upgrade licence that brings an existing LANCOM Advanced VPN Client licence for Windows up to the current version. It is for companies whose remote staff already use the LANCOM client with LANCOM VPN gateways and routers, and want the current release on Windows 10 and Windows 11 without buying a new full licence.
LANCOM lists the upgrade as the route for licences from client versions 4.1 and 5.2; from version 6.0 onwards updates are free, and licences older than that (before V1.3 and V2.0–V3.1) need a new full licence instead. The product is now offered under the R&S®LANCOM name.
Before you order: This is an upgrade, not a full licence: you need an existing LANCOM Advanced VPN Client Windows licence (version 4.1 or 5.2) and its serial number. If you are on V6.x already, updates are free; if you have no licence or an older one, you need the full licence instead.
What's in the Box
- Upgrade licence key for 1 user (LANCOM lists a printed licence key)
What It Means in Practice
- You enter the 15-character upgrade key together with your client's 8-digit serial number on LANCOM's upgrade page, and receive a new 20-character licence key to activate the client online or offline.
- One licence runs on one system at a time; it can be deactivated and moved to a new PC.
- After the upgrade, updates within the version are free.
- The client works best with LANCOM VPN gateways; features like Seamless Roaming need LCOS 8.6 or later on the router.
What Will Not Work
- It does not work without a qualifying existing licence — it is not a stand-alone full licence.
- It does not cover macOS; the LANCOM Advanced VPN Client for macOS is a separate product.
- It does not add users: one upgrade licence = one user/system.
- Licences from before V1.3 and V2.0–V3.1 cannot use this upgrade.
Key Features
IPsec VPN
IPsec with IKEv1 (main/aggressive mode) and IKEv2, pre-shared keys or certificates, NAT-T and IPComp.
VPN Path Finder
IPsec-over-HTTPS fallback when IPsec is blocked by hotel or guest networks.
Seamless Roaming
Keeps the tunnel up when switching between LAN, Wi-Fi and mobile.
Integrated firewall
Stateful inspection for IPv4/IPv6 with detection of secure and unsecure networks, plus 1-Click-VPN.
Technical Specifications
| Identification |
| Part Number |
61603 |
| Brand |
LANCOM (R&S Networks and Cybersecurity) |
| Type |
Software upgrade licence, Advanced VPN Client Windows |
| Licence |
| Users |
1 user / 1 system at a time |
| Qualifying versions |
V4.1 and V5.2 licences (V6.0+ updates are free) |
| Delivery |
Licence key (printed licence key per LANCOM) |
| Activation |
Online or offline, with client serial number |
| Software |
| Operating system |
Windows 11, Windows 10 (Intel x86-64) |
| Languages |
German, English |
| VPN protocols |
IPsec (ESP/AH), IKEv1, IKEv2, IKE config mode, DPD, NAT-T, IPComp |
| Fallback |
IPsec-over-HTTPS (VPN Path Finder) |
| Other |
Stateful inspection firewall, Seamless Roaming, 1-Click-VPN, IPv6 VPN, VoIP prioritisation |
| Warranty |
| Warranty |
1-Year Warranty (Singular) |
| Manufacturer Term |
Software licence — manufacturer does not publish a separate warranty term; licence issues handled through Singular |
Frequently Asked Questions
How do I know if my licence qualifies?
Check the version shown in your client's licence information. V4.1 or V5.2 qualifies for this upgrade; V6.x updates for free.
Can I move the licence to a new laptop?
Yes, deactivate it on the old system and activate it on the new one.
Does it work with non-LANCOM VPN gateways?
It is a standards-based IPsec client, but it is optimised for LANCOM gateways and some features, such as Seamless Roaming, need a LANCOM router.
Singular Expert Insight · Buyer's Guide
Upgrading an existing licence is far cheaper than a new seat, but only if the version qualifies — check the licence info in the client before ordering. If you are reviewing the VPN gateway side as well, see our
firewall range.
✓ Buy it if your users run LANCOM Advanced VPN Client Windows V4.1 or V5.2 and you want the current version on Windows 10/11.
✕ Skip it if you are already on V6.x (updates are free), have no licence, or need macOS.
→ Also consider the full LANCOM Advanced VPN Client Windows licence for new users or older versions.
Not sure which licence you have? Send us the client version and serial and we will confirm the right licence before you order.