We do not store account information. When you enter an alt in the "saved alts" they are encrypted locally to your PC. Otherwise they are not saved anywhere.
@crispycorn Hi! Try deleting your existing Aristois install and then installing the Donor version. Make sure you delete your old Aristois installer if you still have it. The installer should say something along the lines of 'Donor Version'
The donor version looks exactly the same as the free version in the installer. It will overwrite the free version you had installed.
You need java installed on your machine. Right-click the file and select "open with Java", or open terminal and then use the command java -jar and drag the Aristois jar file in.