Please backup database from old computer.
Step 1. Go to Utility (도구).
Step 2. Click "Backup Database 데이타베이스 백업".
Step 3. Save database to removable disk like USB.

And then plug in removable disk to new computer and restore database.
Step 1. Copy the backup file on the removable disk
(example, "ChurchBookDB_05_28_2022.mde").
Step 2. Rename the file to "ChurchBookDB.mde".
Step 3. Click "Utility"->"Restore Database 데이타베이스 복원" button and
then you will see the following popup message
"Please find ChurchBook.mde (ChurchBook.mde를 찾아주세요)"
When a message appears, a window called "File Open" appears,
Find "ChurchBookDB.mde" on the removable disk and select it with the mouse.
Just click the [Open] button.