I made a copy of my VirtualBox ArcaOS 5.0.7 in order to upgrade it to 5.1.0 to see how well that worked. When I checked the results of the upgrade it looked pretty good.
I did notice something odd though with the upgrade which was that the new ArcaMapper only had a logon icon while the fresh install had 8 items. The upgrade also was missing the exe files for those 8 icons. The Fresh install was complete and the new ArcaMapper was able to connect to a Windows 10 computer on my network but I have not yet been able to connect to Linux. I will have to do some more reading on this but first glance it appears it only works on modern Windows peers. Maybe it also works on networks with domain controllers but I need to research this some more.
Also missing from the upgrade was the Arca Package manager.
The upgrade left all my installed programs (OS/2 and WinOS2) working fine and that is a time saver for sure.
With new releases there are bound to be issues likely fixed in 5.1.1
