Update check, your call. On start the tool looks at the GitHub releases page in the background (no API, nothing sent but a normal page request). If a newer version exists, a bar offers Update / Later / Skip this version — nothing is downloaded until you press Update. Update fetches the new exe, checks it is a real executable, swaps it in place of the running one and restarts; the previous file is kept as dlss5oneclick.exe.old until the next start. dlss5oneclick.exe --update does the same from the command line.