Hi Andrey,
I'll try to assist as good as I can ...
Re 1. '... you have seen "Thank you for registering" message ...'
Not sure about that, yet I clearly remember, that it took 3 attempts until the entered code finally was accepted. Rejection occured, because I tried to move the code from the PC (where I received the email with the code) to the Tablet via a txt file. This failed due to text-code standards, I suppose. Only after I forwarded the code message to a separate email account and accessed it with the Tablet this way, it worked. (I keep my Google/Android account separate from my regular private stuff as good as possible. Therefore I'm used to hazzle of that kind.) The rejection experience before registration can be taken as an indication that registration was to the apps convenience.
And as I had stated in my first post: Pro Trial doesn't allow to link the Tablet and the PC via WiFi. That is the only reason why I purchased MLO Android right away. I didn't want to just play around with an empty or MLO database file for testing. WiFi link worked after 'registration', which is the second indication for havng registered successfuly.
I used v 2.016 at that time.
Re 2. 'After some time you installed an update for the app and the registration gone? ...'
Yes and No.
For the 'No': The app v. 2.016 went into Trial Mode on the third day of use, yet only temporarily. This was the reason for my initial post in this thread, where I describe the occurence in some detail. The attached photo shows a "42 days left" dialog, which indicates, that the two days of already registered use somehow were added to the regular 40 day testing period ... just a guess.
BTW. I did noth confirm that dialogue box (neither "Buy Pro Now" nor 'Continue FREE') but hit Androids back arrow button instead and checked the WiFi link (my feature of interest) which still worked. I could continue without being bothered again.
For the 'Yes': As stated in my second post, I installed v. 2.017 and got the Trial Mode statements right away while funny enough, WiFi link still worked. (which it should do in real Trial Mode, right?)
After entering the registration code again, settings showed registration to my user name. Things run just fine since then ...
Re. 3. '... If you entered an Activation Code you should not see these messages ...'
That's what I thought ... my experience is somewhat 'grey', though. I'm afraid, this would take more feedbacks from other users, which is why I did the post in the first place. If I face any problems of that kind again, I'll report.
Thanks a lot (also for the future-flags :-)
Wolfgang