如果發現C Drive 沒有空間或version upgrade 失敗，可能是Java Cache 滿了。
1. On desktop, open “Java Web Start”
2. File à Preferencesà Advanced
3. Find and click the button labeled “Clear Folder”. A confirmation dialog should pop up at this time. Uncheck the checkbox labeled “Also remove downloaded applications and certificates”. This is important!
4. Yes
