从官方网站下载试用版，然后用下面的方法就能去掉【试用版】字样，变成正版。
复制下面的文字，保存到rarreg.key,把此文件保存到winrar安装目录即可。
RAR registration data
Federal Agency for Education
1000000 PC usage license
UID=b621cca9a84bc5deffbf
6412612250ffbf533df6db2dfe8ccc3aae5362c06d54762105357d
5e3b1489e751c76bf6e0640001014be50a52303fed29664b074145
7e567d04159ad8defc3fb6edf32831fd1966f72c21c0c53c02fbbb
2f91cfca671d9c482b11b8ac3281cb21378e85606494da349941fa
e9ee328f12dc73e90b6356b921fbfb8522d6562a6a4b97e8ef6c9f
fb866be1e3826b5aa126a4d2bfe9336ad63003fc0e71c307fc2c60
64416495d4c55a0cc82d402110498da970812063934815d81470829275