You should start by determining how it knows the trial is expired. Try installing it without internet access to see if it phones home. If it gives an error before installing, (but doesn’t say the trial is expired) it might be phoning home to see if the trial is expired. If it installs offline and still tells you the trial is expired, then that probably means it left some trace of itself somewhere on your computer. Once you know which method it uses, you can start to work on bypassing it.