Recent content by happy day

I got all product code, serial number and password. But I am having "register failed" alert when I entered all keys. Is this becasue different version issue? Can you let me know how I can check this is different version issue? Thanks

Recently, I had replaced my machine and I downloaded pl/sql developer trial version to use until out IT dept install it. My question is Do I have to remove the trial version and install new one? I found there is register link under help which requires product code, serial number and pasword...