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That repo doesn't have any releases. Pulumi needs a github release to be able to download the plugin.
You might be able to clone and build that provider yourself, but this isn't an officially supported package and given it hasn't been changed in a year might not be functional.
There is also an issue at <https://github.com/pulumi/pulumi/issues/6877> tracking support for vultr.

where should i put compiled binary for pulumi to use ?

Hi Priyanshu,

The linked repo is very old and as Fraser wrote miss the binaries.

Would make sense to bridge it freshly from scratch

I can have a look into it if you only want to use go for the start