How do I download Windows 64-bit installer?

Server Version#: 1.40.2.8395

I believe I am still running 32-bit Plex Media Server (at least it says 32-bit in task manager).

I have been going round and round in circles trying to find the 64-bit installer but I always end up back at the downloads page (www.plex.tv/en-gb/media-server-downloads/?cat=computer&plat=windows#plex-media-server) and there is no 64-bit option.

Please can somebody point me to the link for the 64-bit installer?

Right place. Click the “Choose Distribution” button and it will prompt for 32 and 64.