The program can be downloaded anytime from here http://www.avast.com/en-no/download-software

Then you insert the license, as you did in your first install…how did you do that…repeat it

avast! 5.x: How to insert the license key file into avast! Pro Antivirus / Internet Security?
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=518&nav=0,1,21

For detailed step-by-step instructions please read the following articles:
http://support.avast.com/index.php?languageid=1&group=eng&_m=knowledgebase&_a=viewarticle&kbarticleid=476

contact avast http://www.avast.com/en-no/contacts