Recommend the most suitable theme for an Upload and Download website (VPS host plan)

Dear Envato Staffing Team

Good day to you

I have a domain name and a VPS Hosting plan. I asked a website developer to create and publish my website. Unfortunately, she spent a lot of time with no result.

I decided to do it myself.

I like all of your themes … and I am planning to get one suitable for my website.

My website will contain library for upload and download medium to big files. It will a little bit similar to www.grabcad.com

The most theme I like sorted from highest to lowest are as follows:
Stockie
Norebro
Bifrõst
Avada

Can you please to check if these themes are suitable for my future planned website or not ?
please recommend the beast and the most easy one for use.

Also, please recommend a suitable plugin for upload and download files by my customers but allow me to review before publishing.

Thanks and regards

Hamdy