If you cannot activate a license offline because you are using the free tier, the best strategy is to bypass activation entirely by using a portable version on an already-activated machine.
On the offline machine, go to Window > Preferences > Katalon > Update and uncheck "Check for updates." This prevents annoying error pop-ups every time you launch the tool. katalon offline activation free best
Why this is the "best" (but not free): It is secure, permanent, and compliant with SOC2 and HIPAA regulations. For enterprise testers searching for "free," this is the gold standard you should ask your IT department to fund. If you cannot activate a license offline because