plugin-helper/docs/notes/windows-logs.md

cd C:\Program Files (x86)\Steam\steamapps\common\Beat Saber\logs>
Get-Content .\_latest.log -Wait -Tail 50

-Tail 50 shows the last 50 lines; -Wait keeps following new output (like tail -f).

Shorter alias:

gc .\_latest.log -Wait -Tail 50