The activation code is valid permanently.
Currently, the limit is 3 computers, but this may be adjusted in the future.
Yes. Every time you have note updates, use the "Download Data" feature in the software. All your notes will be automatically downloaded to the evernote.db file in the "Data Directory." As long as you keep this file safe, all your data remains in your control.
You can create a temporary notebook in Yinxiang Biji, move the notes from the Trash into that notebook, and then download and export that notebook as usual.
On Windows, macOS, and Linux, the "Home folder" is where your "Downloads" folder is located.
C:\Users\YourName, or simply enter %USERPROFILE% in the file explorer address bar and press Enter.~ directory.

If you encounter difficult issues that cannot be resolved through simple communication, we can provide remote assistance. Before this, please install the ToDesk software.