Today I finally got an email by the support technician with a link to purchase the Mac version. And the price was OK, only 29.99 Euro for a year.
Seemingly, they can offer the licenses with different prices? Also the link to Paypal did NOT add any additional cost. I have NEVER heard of that Paypal would have added anything to a payment. I run a webshop as well and Paypal charges what you tell Paypal to charge. Anything else is stupid.
One more time: the purchasing page for the Mac license is NOT reachable through the Avast website. If you say something different, proof it.
If there would be - on one page - an offer like:
secureline for Windows
secureline for Mac
secureline for iOS
secureline for Android
there would be NO MORE confusion. But you are hiding a Mac option while offering a PC version (what could mean both Mac and Windows to me, a PC is a Personal Computer, with ANY software on).
Inside the secureline app, all buttons that would allow to purchase an update are disabled. Nothing works. I am running the newest OS El Capitan. Happy Hunting for the error. I told this several times to the hotline and wrote it in the support tickets. If you still do not know about this problem, you have a different problem - in your inhouse communication.