Tonne Software logo
Download page for Elsie the filter design program



 
Go to the Elsie key-purchase page
 
Go to the Elsie page
 
To Tonne Software homepage
 
Contact us
When Elsie is run, it normally operates in the Student mode. If it finds the purchased key, it automatically upgrades itself up to the full Professional mode with no effort on the part of the user.

By purchasing the key - priced at US$195 - the program will automatically operate in the Professional mode.

The keyless Student mode of operation is designed for the student, hobbyist or light industrial user. It is limited to seven "stages" (dipoles) of components. This has been done to encourage purchasing the key to unlock the program up to the Professional level. Otherwise the two modes of operation are identical.

Elsie is supplied as self-extracting 32-bit Windows® installation file of about 6MB.

Updates are free; just come to this page, download and then run the installation file. It will uninstall the old version and then install the new version. The Student edition needs no key. The key you purchase will unlock the free Student edition up to the Professional edition, even after installing a new version.

The current version of Elsie is 2.55 - get it here:
Download Elsie