Where did MagixAVC go?

I'd undo all these changes to internal settings by resetting VEGAS and try again.
https://www.vegascreativesoftware.info/us/forum/faq-how-can-i-reset-vegas-pro-to-default-settings--104646/

Yes, follow my actions.

- I uninstalled, downloaded and installed again.
- I reset with CTRL + Shift
- I made the change in 'internal'

None of these actions brought the AVC/AAC option to my render panel.

Did you try finding MagixAVC before you made the internal changes?

I'd change the legacy Mainconcept render internal preference back to false.

In the meantime you could use SonyAVC.

Magix AVC is what you want, not Mainconcept. All of the presets in Magix AVC that do not have (NVENC), (VCE), or (QSV) next to them utilize the Mainconcept CPU encoder.

Also, undo the internal preference changes, you are doing more harm than good.

O que você quer é Magix AVC, não Mainconcept. Todos os presets em Magix AVC que não têm (NVENC), (VCE) ou (QSV) ao lado deles utilizam o codificador de CPU Mainconcept.

Além disso, desfaça as alterações de preferência interna, pois você estará causando mais mal do que bem.

Greetings. I don't have the "Magix AVC" format, do I need to change anything from the original settings?

PS: I reverted all the changes I made previously.

@Cateroide I'd file an official support request as it should be here.

Sony AVC will give you AVC/AAC as well.

The images you show are indicating that you are trying to do a "render to new track" and it is missing some formats. A bug has been reported (and at least one thread here on the forum) and we are working on a fix.