HELP! Can't install new Licence

I renewed my Avast licence yesterday, received my email and licence but it wont work…why! Can some one please advise?

Just keeps saying “Unable to insert license file. The system cannot find the file specified” this means???

does his help?

how to insert license
https://support3.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1084