I've found a way I don't know why I haven't seen it on other websites before but here goes
1-press shift and double click the deep freeze icon in the task bar
2-write down otp token
3-open deep freeze console from the start menu faronics' folder
4-press tools ------- then one time passwords
5- in the token area write the otp token which you have written before , then click generate
6- now copy the generated password and open the deep freeze task bar icon again and paste the password then the dialog will appear where it says it can reboot thawed for 1,2,3......etc times so you choose and make the changes you want including uninstalling deep freeze , just wanted to share sorry if it doesn't work or anything