Hello Yulia Vitun,
Greetings of the day.
Thanks for your message.
Please try to install and uninstall the process on the below test instance.
Also, the module is configured and working fine on the below test instance .
Please watch the demo video about how to install, configure and use the module.
Back Office URL: https://www.hrms-systems.com/pstest/admindemo/index.php
Username: [email protected]
Password: Demodemo123