Updated installation scripts

[okineadev]

Describe the changes you have made:

I must point out that your installation scripts were bad because they first download to some unknown folder, then grant permissions to execute, then execute the script itself And if he fails?? Then the installer won't even uninstall.

So I fixed these scripts and shortened them, I tested them, everything works

Pre-Submission Checklist (optional but appreciated):

• [x] I have included relevant documentation updates (stored in /docs)
• [x] I have read docs/CONTRIBUTING.md
• [ ] I have read docs/ROADMAP.md

OS Tests (optional but appreciated):

• [x] Tested on Windows
• [ ] Tested on MacOS
• [x] Tested on Linux

[KillianLucas]

Brilliant. This is absolutely the way to do it. Great work on the installers again Okinea, merging!