The SoftimageLicense.log file is located in the %TEMP% folder. To find or open the log file, you can simply type %TEMP% in the Windows Search box, in File > Open dialogs, or in the Windows Explorer address bar. The environment variable is automatically expanded to its full value (which is something like “C:\Users\blairs\AppData\Local\Temp”) when you press ENTER.
For example, click the Windows button, type %TEMP%\SoftimageLicense.log in the search box, and then press Enter (or click SoftimageLicense.log in the search results).