Beware of fake websites. The official Meteor Client does not support 1.16.5 via the main launcher anymore. You must look for "Legacy Builds" or "Archive Builds." As of 2024, the developers have moved on, so the last official 1.16.5 build is marked as "EOL" (End of Life).
Meteor Client is an open-source utility mod designed for the Fabric mod loader Meteor Client 1.21.1- 1.20.6 -- 1.16.5