It might be better to ask on the 'Communities', Server Gurus section of the forum.
AMD Download page only has drivers for the Radeon Pro V340: https://www.amd.com/en/support/professional-graphicsradeon-proradeon-pro-v-series/radeon-pro-v340
But according to AMD webpage for the V520 here is a driver from Amazon AWS . Not sure if this is what you are looking for: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/install-amd-driver.html
Looking at the latest Radeon Pro drivers including Windows Server 2016 & 2019 I don't see the V520 listed as being compatible.
I suggest you open a AMD SUPPORT Ticket and see if they have any driver for your V520 besides Amazon AWS Driver from here: https://www.amd.com/en/support/contact-email-form
NOTE: it seems like the Radeon Pro V520 is not compatible with Windows. Similar to AMD Instinct which is only compatible with Linux OS.