Kaspersky Tweak Assistant is a GUI tool that resets the trial period of Kaspersky products.

Supported Kaspersky Releases
2019
Kaspersky Anti-Virus v19.0.0.1088
Kaspersky Internet Security v19.0.0.1088
Kaspersky Total Security v19.0.0.1088
2020
Kaspersky Anti-Virus v20.0.14.1085
Kaspersky Internet Security v20.0.14.1085
Kaspersky Total Security v20.0.14.1085
Kaspersky Endpoint Security v11.4.0.233
2021
Kaspersky Anti-Virus v21.1.15.500 + v21.2.16.590 + v21.3.10.391 + 21.5.11.384 + 21.6.7.351
Kaspersky Internet Security v21.1.15.500 + v21.2.16.590 + v21.3.10.391 + 21.5.11.384 + 21.6.7.351
Kaspersky Total Security v21.1.15.500 + v21.2.16.590 + v21.3.10.391 + 21.5.11.384 + 21.6.7.351
Kaspersky Endpoint Security v11.8.0.384 + 11.9.0.351
Kaspersky Small Office Security 21.3.10.391 (g) + File server + 21.5.11.384 + 21.6.7.35

Instructions for Using KTA to Perform Reset

Disable Kaspersky protection.
Disable Self-defense.
Close/exit Kaspersky from taskbar (check task manager too if Kaspersky still running or not, close from there if running there too)
Run Kaspersky Tweak Assistant tool.
Now click on the "RESET" button, it'll reset your Kaspersky application & the system should automatically restart (do manually restart if it doesn't restart automatically).
Now you're ready to use another trial period of Kaspersky.

Instructions for Using KTA to Perform License Import & Export

Disable Kaspersky protection.
Disable Self-defense.
Close/exit Kaspersky from taskbar (check task manager too if Kaspersky still running or not, close from there if running there too)
Run Kaspersky Tweak Assistant tool.
Now click on the "LICENSE" button to open "LICENSE UTILITY".
If you want to save/export license key file then click "EXPORT", the license file will be exported on the same directory where the KTA tool is located.
If you wanted to restore/import the license key file then click "IMPORT", choose the license file and your Kaspersky product will start loading with the activated added from the imported license file.

Only for V.I.P