Version 1.6.0 and 1.6.2 keep the settings in <AppData>\Local\lazarus
For updating from 1.6.0 to 1.6.2 , I just ran the setup, let it uninstall the previous version, tell it to KEEP your settings and install in the same place.
Windows 10 x64
I don't know about an old version like yours though.
[EDIT] As the others said, you need to rebuild the IDE after installing it and runnning the first time!