Hi Biginner,
Are you talking about the LifeTime application version or the Platform Server version of your LifeTime environment?
For the application version, you can search for the LifeTime application via Factory >> Applications and you will find the LifeTime application version in the description.

For the Platform Server version, you can find it in Service Center too on the right-side.

Hope this helps.
Regards,
Nordin