Vegas15 and 21 share a rendering template directory C:\Users\USER_NAME\AppData\Roaming\VEGAS\Render Templates.
So I hope that some render templates I customized for Vegas15 do not appear in Vegas21.
How can we do this?
This has been done for a long time, but it is still not ideal and takes up too much UI space.
To make it simplified, how to add a suffix like xxxx_VP17only?
... and takes up too much space.
If you only use VP15 and its render templates rarely or just occasionally - or want them retained for "just-in-case" - they could be moved out of the Render Templates folder and put on to some form of storage media from where they could always be copied back into the Render Templates folder if needed in the future.
Just give the rendertemplates you like to use only in VP21 a favourite flag.
What's the aim to have VP15 installed besides VP21?
If you only use VP15 and its render templates rarely or just occasionally
Unfortunately, VP15 is often used in teamwork, so that partners' VP16, 17, 18 and 19 can open project files. Therefore, this method may not be practical.
have VP15 installed besides VP21
There are many reasons for this, such as teammates having different versions of Vegas.
give the rendertemplates you like to use only in VP21 a favourite flag.
This may be a workaround, but because the number of codecs is not as huge as FX, I haven't got into the habit of using render template favorites in the past. But it's a workaround anyway.
When editing in a team, at least every team member should have access to the same version with the same possibilities.