If your download trial is over 60-day period, you cannot extend the trial duration by simply copying the license from another download trial or overwriting the existing Splunk instance with a fresh download copy. (this is most likely your case since you mentioned 'splunk.license' file name, commercial/paid enterprise license files are named differently.)
Also a download trial only allows 3 warnings before it locks down your search (except searching _internal index).
A reset license only allows to reset the count of the warnings but will not extend your trial license for another 60-day window.
I am using splunk free, i head 5 hard warnings before when i was still under 500MB/day and the disk space now is 5GB/day after splunk.license file installation but i am still under violation, i can not do anything.
Even i am facing the same thing, i was using 500MB/day trial and feeded in 30GB logs
index=* shows me the logs in search
but since i was getting warning so i added NFR license for 20GB valid till next 1 year (with the name splunk.license) and now looks like indexing has not started as daily quota is not utilized for today's 20 GB.