It is possible to migrate the data between both instance. First of all, please make a backup of your Testlink 1.9.14 instance. Basically, you would have to migrate the database from one instance to the other. In order to do so, you can use
In the old machine:
mysqldump -u root -p bitnami_testlink > testlink_backup.sql
testlink_backup.sql file to the new machine. To upload files to your server, could you please follow the steps detailed in this guide?
Then, execute the following command:
mysql -u root -p bitnami_testlink < /home/bitnami/testlink_backup.sql
Please let us know if this solves the issue.
Javier J. Salmerón