https://screencast-o-matic.com/screenshots/u/Lh/1558386268375-89722.png
https://screencast-o-matic.com/screenshots/u/Lh/1558386404803-42850.png
I saw a notice on the Avast sys. tray that there was a program update.
Since it’s not posted on the forum, you can update from within the User Interface or
get the downloads from here: https://goo.gl/4Ptzkf
It is very unusual that avast not give stable version official changelog on forum. ???Got the notice and update via GUI…
Edit:My Smart scan UI not changed.It still use Old UI with no info.
Have you rebooted it after the update ?
If you have I believe there have been a couple reporting it needing to be rebooted twice. I’m in no rush.
No.Only single reboot done but going to do that ASAP 
Edit:No solved. 
Is an official version, the release day is marked as 9 April 2019, if we are in the month of May, what will be shown is the date current ?
I stay old version from here or expect to update later ?
You should update to new.
It was earlier version release day(19.4)
My avast 20th may/2019(19.5)
an error in the current interface UI ?
Always before updating, we were informed of the release date of the update.
Open Avast-> General → Troubleshooting-> Open old settings.
The message is display correctly
Maybe… :-\
You could try an Avast Repair. This used to resolve what I call and out of sync condition. e.g. where what is reported differs from the physical state.
Avast! 19.5.2378
Free
https://files.avast.com/iavs9x/avast_free_antivirus_setup_offline.exe
Pro
https://files.avast.com/iavs9x/avast_pro_antivirus_setup_offline.exe
Internet Security
https://files.avast.com/iavs9x/avast_internet_security_setup_offline.exe
Premier
https://files.avast.com/iavs9x/avast_premier_antivirus_setup_offline.exe
Mine as well. We were told at launch of 19.4, it was being set geographically to avoid burnout but even after a month down the line and a version upgrade i.e. 19.5, smart scan UI remains old.
And yes, I have rebooted more than 4 times just in case anyone asks. 
Here is the proper topic, excuse the small delay.
https://forum.avast.com/index.php?topic=227342.0
After updating to 19.5 through the UI I had to reboot twice. The smart scan was not working correctly (it did not increment the percentage and stopped after a while). I tried to stop the scan but that did not work. I closed the UI and started the UI again from the systray and it stated that the scan was completed. I then ran smart scan again and the same happened.
I then did a repair from control panel and all seems to be okay now. Will try a smart scan again later to ensure all is well.
Repair did not change status of message.I think they tried to modify since new UI introduced which was not a good idea.I decided to update now.
Just do the update to the latest version.
Update works without problems.I do not needed to restart 2 times with last time.
lack of space in the text in smart scanning (virus scan) in other languages.
Why is your smart scan still showing the old interface?
https://screencast-o-matic.com/screenshots/u/Lh/1558442849482-63504.png
https://forum.avast.com/index.php?topic=93544.msg1506370#msg1506370
Hi Bob,
Even I have pointed out few posts above that my interface is old as well. Using Avast free antivirus 19.5 latest. Do not know if this is still going to be geographical based switch to new UI.
It appears not all v 19.5 have the new UI (no Circle)
Both my installations, stable and beta 19.5 are not the same UI.
Stable version 19.5 has the old Circle scanning in my installation while the beta version 19.5 does not.