If you bought the Standard Edition more than one year ago, you only qualified for free upgrades for one year after your purchase. You can solve this by upgrading to the Professional Edition (which offers free upgrades for life) at

https://www.hamrick.com/regu.html

You can get the version number of the latest free upgrade that you qualify for on a new receipt at:

https://www.hamrick.com/rep.html

You can find old versions of VueScan at:

www.hamrick.com

Scroll down the page a bit to find this. Please note that we don't have any other old versions available.