As of version 4.4.0, SDS is now a one file executable that requires no installation and stores all its settings for portability. For convenience and ease of use, you may now use SDS either on your desktop, or take it with you on the road. It's up to you how you use our product. Others charge for portability, we see it as a customer service.

You can download the portable versions from this page: http://www.sdiary.com/download_portable.php

Of course non-portable versions of SDS are available as usual from this page: http://www.sdiary.com/download.php

You are free to run both versions on the same machine, but not at the same time. Please note that by using the portable versions, you agree to this EULA: http://www.sdiary.com/SDLicense.rtf.