Upgrade from LL4.4 to 4.8 does not work

[eikelein]

Hi;relatively new to Linux but an  "old dog" with MS PCs.
I attempt to upgrade from what is supposed to be LL 4.4 to 4.8. Here is what System Info tells me:
SummaryComputer[table][tr][td]Processor[/td][td]AMD A8-3820 APU with Radeon™ HD Graphics[/td][/tr] [tr][td]Memory[/td][td]11765MB (1000MB used)[/td][/tr] [tr][td]Machine Type[/td][td]Desktop[/td][/tr] [tr][td]Operating System[/td][td]Linux Lite 4.4[/td][/tr] [tr][td]User Name        .....[/td][td][/td][/tr] [tr][td]Date/Time[/td][td]Mon 10 Feb 2020 11:27:06 AM CST[/td][/tr][/table]
Attached is the log of the failing update.
Lite Upgrade laconically tells me "You are already running the latest release." Since that tool {Upgrade} seems to be for ugrades to other series like 5 it may be correct.

But how do I get to 4.8 without a completely new install?

Any helpful tips are highly appreciated.
TIA Eike