Sorry for the trouble but where would the log you want be located? the one in the .minecraft folder seems to only be from the time I launched it without forge to test if forge was the issue.
Whenever I attempt to launch with forge installed I get this error:
Instance update failed because: Game update failed: it was impossible to fetch the required libraries.
Reason:
Job 'Libraries for instance 1.16.5' failed to process:
https://maven.minecraftforge.net/de/oceanlabs/mcp/mcp_config/1.16.5-20210115.111550/mcp_config-1.16.5-20210115.111550.zip