A BIG THANKS to you all! It is great to have a forum like this!
It was a problem with the configuration from Windows 10 as "stl" mentioned. every time when I opened the downloaded file I didn't noticed the wrong text "update.zip.zip". However I always have "View hidden items on, but I haven't noticed the wrong text.
I did update to CFW 2.1.7 which is nice, but how do I install all the other apps like YouTube smart tv, Aptoide etc. etc.? I'm a little confused now after my 2 days experience. What is the latest and best CFW until today? I have seen 2.1.6 updated and corrected by Pcristi, but I'm not sure.
Please, one more time support on my last question.
Version 2.1.7 is actually the latest "official" firmware.
To install the apps download this file, rename it to update.zip and install it with the reset button method or through the settings menu which I find more practical in this case:
https://www.mediafire.com/file/0vhnhyzf5nyr2kr/file(patch
The latest CFW from pcristi is version 2.1.6 that can be download from here:
https://www.mediafire.com/?kvlryqpyzcac3#o4h15793c0a0e
I really like the "official" version 2.1.7 but if you want a very different look and feel from your box I recommend the Android TV (ATV unofficial) version of the CFW.