After delete file .slm, .slmauth, and .slmbackup, you can repeat installation after trial time limitation.
How to delete:
[METHOD 1]-under [Terminal]
Key in following command under [Terminal]
cd /private/var
ls -la
rm -r .slm
rm -r .slmauth
rm -r .slmbackup
[METHOD 2] under help of any software (eg. tinker too; totalfinder....) that could show the hidden and system files
show hidden and system files
go to directory: /private/var
del .slm .slmauth .slmbackup
reinstall