Can someone provide exact instructions for installing version 10 without removing the older version?

[jecrensh 0]

I'm curious to try version 10 for Mac, but after reading some of the reviews, I'm hesitant to ditch the old version altogether. I've seen references to installing the new version in parallel to the old (that is, installing the new app without overwriting the legacy app). I've also seen where some people just lucked into that, and others wish they had done that. Thanks for any specific guidance for a parallel installation of version 10. 

Edited December 14, 2020 by jecrensh
clarification

[DTLow 5,736]

45 minutes ago, jecrensh said:

I've seen references to installing the new version in parallel to the old.

The Version 10 product is named Evernote.app; and overwrites the Legacy product  of the same name 

To reinstall the Legacy product, download from  https://help.evernote.com/hc/en-us/articles/360052560314-Install-an-older-version-of-Evernote   
The app name will be EvernoteLegacy.app

There are no concerns about the notes database.    
The local database copies are different, but both  products access the same master database on the Evernote servers