Installing .net 4.8 on POS machines can fail for a number of reasons. There are a few troubleshooting steps below to assist with this, but if all of these fail, the only realistic fix will be re-imaging the machine, in the last resort.
Instructions
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Run this CMD at command prompt or via ScreenConnect commands to verify current installed version of .net: reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\full" /v version
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If Bepoz 4.7.3 has been installed prior to .net being updated, do not press yes on the prompt 'Do you want to install .net 4.8'
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Initially try to install using the .net web installer as it will download all the latest updates
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Else download to the machine the offline x64/x86 all OS installer
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If still failing, ensure all windows updates are downloaded and installed with a reboot
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If errors in windows update, can try this windows update reset tool and work through the steps top to bottom
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If all of those have failed, the only remaining option is to reimage the machine with a fresh install of windows