Error installing dll into GAC on Window s10 PCs

We've had a problem recently with a desktop app installation using Inno. After installing all the dlls into the Program Files folder, on certain Windows 10 PCs the GAC installation is failing. The error message we're getting in the Inno log file is below:

2019-02-27 08:00:12.696   Installing into GAC

                      C:\Program Files\OURAPP\DevExpress.XtraLayout.v18.2.dll                          
                      InstallAssembly failed; code 0x80070005.
                      Access is denied.

There shouldn't be an access issue as the user has already successfully elevated access to install into Program Files. Previous installs have worked correctly. Reports we're getting from some users is that it's affecting a small number fo Windows 10 PCs. In one case a Windows update fixed the problem, in others Windows is fully updated.

I should also add that the issue coincided with a Devexpress upgrade from 18.1 to 18.23.

Any insights into what might be causing this?