You paid for the renewal. Kaspersky still shows License expired in the bottom-right corner and the tray icon is red. Annoying, but there's a reason for it: Kaspersky doesn't re-check your subscription on its own schedule. It keeps a cached license blob on disk, and until that blob gets refreshed against the activation server, it'll keep reading the old expiry date.
The culprit here is almost always a stale license file, not a bad activation code. Work through these in order — most people fix it on step one.
1. Force a license sync from the app (the fix that works 80% of the time)
Kaspersky pulls its license status during a manual sync, not on a background timer you can see. If you renewed through the Kaspersky portal or a reseller, the new license sits on the server until your client asks for it.
- Open the Kaspersky main window (double-click the tray icon).
- Click the head/profile icon in the bottom-left, then Licensing (older builds say License).
- Find the Refresh button next to your subscription. Hit it.
- Wait 30–60 seconds. Don't click it five times — the activation server rate-limits and you'll just get Activation server unavailable.
If the status flips to Active with your new expiration date, you're done. If it doesn't, or the Refresh button is greyed out, move to step two.
One real-world gotcha: if the machine is behind a corporate proxy or a pfSense box with strict egress rules, that refresh silently fails. Kaspersky's activation endpoints live on activation.kaspersky.com (port 443) and klserver.kaspersky.com. If your firewall blocks outbound to those, no amount of clicking will help.
2. Clear the cached license file and re-enter the activation code
Kaspersky stores license data as a .key file plus a manifest in %ProgramData%\Kaspersky Lab. If the manifest got corrupted — usually because Windows shut down hard mid-write, or because a different Kaspersky product (KIS → Kaspersky Plus, for example) wrote to the same folder during an upgrade — the app keeps reading a dead license regardless of what's on the server.
Close Kaspersky completely first. Right-click the tray icon, choose Pause protection, then Exit. Then delete the cached license folder:
cd /d "%ProgramData%\Kaspersky Lab"
ren Licenses Licenses_old
mkdir LicensesDon't delete the whole Kaspersky Lab folder — you'll nuke your settings, quarantine, and scan history along with it. Just rename the Licenses subfolder. Kaspersky recreates it cleanly on next launch.
Now open Kaspersky and enter your activation code manually. Your 20-character code (formatted XXXXX-XXXXX-XXXXX-XXXXX) is in the confirmation email from your reseller, or under My Kaspersky → Subscriptions if you bought direct. If you renewed a subscription rather than buying a new code, use the Connect to My Kaspersky option instead — signing in pulls the subscription down without a code.
Watch for a trailing space when you paste the code. Kaspersky's activation dialog silently rejects codes with whitespace and reports it as License expired, which is a terrible error message and wastes everyone's afternoon.
3. Activation server mismatch after a product migration
This bites people who renewed an old Kaspersky Internet Security license but have since been pushed onto Kaspersky Standard or Kaspersky Plus. Kaspersky retired KIS 21.3 and earlier in favour of the new naming, and the license type is per-product. A KIS activation code won't activate Kaspersky Plus, full stop.
Check which product you're actually running:
wmic product where "name like 'Kaspersky%'" get name,versionIf it reports Kaspersky Plus or Kaspersky Standard but your renewal email says Kaspersky Internet Security, that's your problem. Two options: ask your reseller to convert the license, or download the KIS installer from the Kaspersky archive and roll back. The archive is at https://www.kaspersky.com/downloads/thank-you/internet-security — scroll to the bottom for older builds. It's ugly, but it works, and the license will accept it.
Also worth checking: if the machine was cloned from an image, the Kaspersky install ID is duplicated across multiple hosts. The activation server sees the same ID activating repeatedly and flags it, which surfaces as an expiry. Run slmgr /dlv — no wait, that's Windows. For Kaspersky, open Support in the app and click Reset activation ID if you see Activation limit exceeded alongside the expiry message.
Quick reference
| Symptom | Likely cause | Fix |
|---|---|---|
| Expiry date is old, code is valid | Cached license not synced | Refresh button under Licensing |
| Refresh greyed out or fails silently | Firewall blocking activation servers | Allow activation.kaspersky.com:443 |
| Expires again after every reboot | Corrupt license manifest | Rename %ProgramData%\Kaspersky Lab\Licenses |
| Code rejected with no reason | Trailing whitespace on paste | Retype the code by hand |
| KIS code on Kaspersky Plus install | Product/license mismatch | Convert license or roll back to KIS |
| Same expiry on multiple machines | Cloned install ID | Reset activation ID in Support |
Skip the old forum advice about reinstalling Kaspersky from scratch. That's a 20-minute detour that fixes the same problem step two fixes in 30 seconds. Only reinstall if the Licenses folder deletion gets blocked by a file lock — which means Kaspersky is still running in the background, and you should kill avp.exe from Task Manager before trying again.