# Proper optim pkg install
**URL:** https://discourse.julialang.org/t/proper-optim-pkg-install/112806
**Category:** New to Julia
**Created:** [April 10, 2024, 10:19pm UTC](https://discourse.julialang.org/t/proper-optim-pkg-install/112806 "2024-04-10T22:19:03Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dkn](https://discourse.julialang.org/u/dkn)
#### Post date: [April 10, 2024, 10:19pm UTC](https://discourse.julialang.org/t/proper-optim-pkg-install/112806/1 "2024-04-10T22:19:04Z")
Hello
I’ve been using MatLab for decade fo numerical analysis
Just foundout Julia and start using in Optimization
But Igot so much err in using Otim pkg even after pkg.add(“Optim”)
How to do it properly
The procedure below
1. create JL file with content
using Pkg
Pkg.add(“Optimization”)
Pkg.add(“OptimizationOptimJL”)
run it with julia
It failed with err below
ΠWarning: could not download [https://pkg.julialang.org/registries](https://pkg.julialang.org/registries)
│ exception = RequestError: schannel: SEC\_E\_UNTRUSTED\_ROOT (0x80090325) - The certificate chain was issued by an authority that is not trusted. while requesting [https://pkg.julialang.org/registries](https://pkg.julialang.org/registries)
â”” @ Pkg.Registry C:\SW\_TOOL\Julia-1.10.2\share\julia\stdlib\v1.10\Pkg\src\Registry\Registry.jl:69
Resolving package versions…
No Changes to `C:\Users\dkn\.julia\environments\v1.10\Project.toml`
No Changes to `C:\Users\dkn\.julia\environments\v1.10\Manifest.toml`
Any idea how to fix it
Sincerely appreciate
DuyKy
---
### Author:  [@mkitti](https://discourse.julialang.org/u/mkitti)
#### Post date: [April 11, 2024, 12:56am UTC](https://discourse.julialang.org/t/proper-optim-pkg-install/112806/2 "2024-04-11T00:56:42Z")
Julia is having trouble establishing a secure SSL connection to [https://pkg.julialang.org/registries](https://pkg.julialang.org/registries) . It seems the SSL certificates are corrupted somehow.
Could you tell us more about how you installed Julia?