Hey Gbenson,
Thank you for your report.
I have been able to observe the issue on our setup and filed an issue in our system, to make sure this scenario is handled better.
As a immediate solution:
Your KeyShot 8 Network Rendering License should be valid for KeyShot 9 Network Rendering without additional cost.
KeyShot 9 Network Rendering is compatible with KeyShot 8 so you should be able to Use KeyShot 9 NR with KeyShot 8.
Since KeyShot 9 Network Rendering includes various stability and speed improvements you should consider updating your setup to KeyShot NR v9.
That will be the fastest solution to prevent this from happening.
The KeyShot 9 network rendering installer should migrate the settings and license from the KeyShot NR v8 setup automatically.