Where SQL Server Reporting Services keeps its logs
SQL Server Reporting Services logs to %PROGRAMFILES%\Microsoft SQL Server Reporting Services\SSRS\LogFiles\ on Windows. 1 other Windows log location is recorded below, including paths for SSRS 2017 and later and SQL Server 2016 and earlier.
Paths are printed exactly as SQL Server Reporting Services writes them. Environment variables like %LOCALAPPDATA% and $XDG_STATE_HOME are never expanded, so a path can be pasted straight into a shell. Where a path differs between installer types or shipping flavours, each one is racked as its own card below - why that happens.
Finding your way around Windows.