I cannot re-activation of Draftsight. I start the software, every time error messages of reactivation appears. But I don't understand how to do re-activation.

I installed this software at Feb.2013. I have used it 6 months. But, error message appeared for the first time.

The error message is Japanese, it means " Please do re-activation within 30 days"

Please tell me the method of re-activation.

Draftsight version;　V1R3.2

Windows version; Windows7 32bit