A certificate chain could not be built to a trusted root authority

Question

During the installation of .NET Framework 4.6.2, I got an error:

.NET Framework installation failed: -2146762486. A certificate chain could not be built

Answer 1

could it create problem to install the same certificate on several systems?

No, it will not be a problem even if the systems would be connected to the internet in the future.

When you connect the system to the internet and do the update it could download a pack of trusted certificates. These certificates will be added to the trusted root store. Existing ones will simply be IMO simply replaced.