Installing in R fails

[BorgeJorge]

When try to install in R with:

con <-dbConnect(duckdb(config=list('allow_unsigned_extensions'='true')), dbdir = "chip.duckdb")
dbExecute(con,"SET custom_extension_repository='http://welsch.lu/duckdb/psql/latest'")
dbExecute(con,"force install psql")

I get:

> dbExecute(con,"force install psql")
Error: rapi_execute: Failed to run query
Error: HTTP Error: Failed to download extension "psql" at URL "http://welsch.lu/duckdb/psql/latest/v1.1.0/windows_amd64_rtools/psql.duckdb_extension.gz" (HTTP 404)

Candidate extensions: "mysql", "sqlite", "sqlite3", "mysql_scanner", "sqlite_scanner"

Am I doing something wrong, or is the extension unavailable in R?

Thanks!