In-place Windows upgrade could cause the Lansweeper service fail to start

Symptoms
Lansweeper service fails to start after server upgrade.

Diagnosis
Investigation confirmed that when performing an in-place system upgrade, the default .NET Framework the Microsoft version ships with, is installed or reverted to.

If this .NET Framework version is lower than .NET 4.8, the lowest required version for Lansweeper, your Lansweeper installation will no longer be functional as the Lansweeper service won’t be able to start.

For example when upgrading from Windows server 2012R2 (with .Net Framework 4.8 installed) to Windows server 2019 will result in a downgrade to .NET Framework 4.7.2 as this is the default version that’s shipped with Windows server 2019.

An overview of the .NET version that is shipped with different Windows operating systems can be found here

Solution
Install .NET version 4.8 or higher on the given device. Note that several reboots may be required for the changes to apply.

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