Thank you for your interest in ZBrush!
We do not currently have a Trial version of ZBrush 4R8. There is no
information at this time regarding when -- or if -- this will change.
We do have a 45 day Trial available for ZBrush 4R7 -- both for ZBrush
The ZBrush Trial requires internet access every time it is launched.
There is no way to bypass this. IF YOUR COMPUTER CANNOT BE CONNECTED
TO THE INTERNET, you will not be able to use the Trial. You will be
able to use a purchased license, however -- only ...
Your operating system doesn't know what to do with a .zlic file since
it's a file format that is unique to ZBrush. Please do not try to open
the license file by double-clicking on it. Simply save the file to a
place where you can easily access it.