SyncBackFree V6 installation warning message

Hello everybody and a very big thank you for your wonderful (and free) software!...

I have a recurrent question (that I ask to myself each time there is an update) which leave me with an insecure feeling, and this is not nice when you talk about data back-up...

I use SyncBack since 2010, I started with SyncBack V3 Freeware, then following updates I am now at SyncBackFree V6 (6.5.4.0). And it works fine except that each time I install one update I have your Upgrade Warning page which shows-up.

I am using non English file names and I am using ZIP files... So I assume I am concerned by this warning... But I don't really understand how to cope with it (sorry I am not English mother tongue and as said above I would like to be able to sleep on my two ears with my backed-up data.

I have no saved data which is not available as primary data, so I thought that deleting the former SyncBack profiles which involved such directories, deleting the saved data then recreating new profiles and running SyncBack V6 on them should solve the problem...

Unfortunately it seems that it does not, because when I installed your last update on these new profiles, I still got the warning message...

Did I miss a step?

Could you please advise?

Thank you

Guy