Installed the update, cleared the temp data. Same problem.

After a couple of delta downloads, the "Prepare download to device" gets really slow. If I try to continue after that, it all stops working like before. If I restart TIA portal after this, it works fine again.

Hi Murof !

Sorry for the late anwser !

I use TIA V19 (i also tried with the V18)

I have W11

I tried the both account, my normal account and my admin account

Yes i have admin rights only on my admin account

AdamDC 

I'm having the exact same problem as well running Tia V20 Update 1.

After about 10 successful downloads it starts to slow down and eventually I got a generic error in runtime manager.

Restarting the Tia Portal seems to solve the problem most of the times.

Edit:
In windows Event I saw this event when the error occurs: