Hello hoekk,
1. Was your Ad-Aware plus version a 2-year maintenance license?
From the FAQ page
http://www.lavasoft.com/support/faqs_sales.php#2QUOTE
How long is my license of Ad-Aware SE valid for?
All updates and upgrades (regardless your version of Ad-Aware SE) are free of charge, depending on how long your maintenance agreement is valid for from the date of your purchase. This does not apply to Ad-Aware SE freeware.
Licenses are available for 1 year up to 36 months
2. Are you upgrading from Ad-Aware SE to the new Ad-Aware 2007 version? Or are you just wanting to re-install the Ad-Aware SE Plus that you had before? If you are trying to install the Ad-Aware Plus SE version, you should have either saved a copy of the installation file or purchased an option for additional downloads beyond the 30 day period after you first purchased your copy (if you used our online sales center at Element5). If you purchased your Ad-Aware from a retail outlet, the procedure may be different.
Also please note for existing Ad-Aware Plus and Pro users, the following notice in the Support Center regarding the free upgrade to the new version Ad-Aware 2007http://www.lavasoft.com/support/supportcenter/index.phpQUOTE
Customers with an existing Ad-Aware SE license will be able to update their software to Ad-Aware 2007 through the Support Center beginning June 21.
This target date for free upgrades for paid users was previously June 18, now June 21.
3. Did you submit a support request directly to the Support Team on the Support Page available for Ad-Aware Plus and Pro users?
http://www.lavasoft.com/support/supportcenter/