If you have admin access:
avp.com ADDKEY /file="C:\path\to\KTS-Subscription-2026-05-24-P-.dat"
Kaspersky has moved away from .dat license files. Current activation uses:
If you only have this .dat file and your KTS version is recent (2022+), you may not be able to import it directly. In that case: KTS-Subscription-2026-05-24-P-.dat
Identify encoding and type
Attempt structured parsers (in order)
Privacy and security precautions
Extract and validate key fields
Produce reports
Re-ingestion guidance (if intended for restore) If you have admin access: avp
| Error | Likely Cause | Solution | |-------|--------------|----------| | Invalid license file | File corrupted or wrong product | Download fresh copy. Ensure it’s for KTS, not KAV/KIS. | | License has expired | System date wrong / file expired | Set correct date or contact supplier. | | Cannot import — no such function | Modern KTS versions (2021+) removed .dat import | Convert to activation code via My Kaspersky portal if possible. | | File not recognized | Wrong directory / permissions | Run KTS as admin; place file on desktop. |