Unfortunately, you haven't mentioned which Vegas product that you are using. As this is the Vegas Movie Studio forum, let's assume that it is Vegas Movie Studio 17 or earlier, keeping in mind that Vegas Movie Studio 17 was the end of the line for Vegas Movie Studio and is now a discontinued product. Movie Studio 2022 (aka 18) is a complelely different product and questions about it can be posted on MAGIX's forum at https://www.magix.info/us/video-forum/

NewBlueFX's product page for Titler Pro 7 lists the NLEs for which Titler Pro 7 has compatibility: https://newbluefx.com/products/titling/titler-pro/ . Note that Vegas Movie Studio is not listed. Also, if TP7 is only compatible with Vegas Pro 17+, then it is likely that it would only be compatible with Vegas Movie Studio 17 - if there is VMS compatibility - which was AFAIK released in the same year as Vegas Pro 17.

A search of this forum revealed no posts about Titler Pro 7 and Vegas Movie Studio; however, there were many mentions of Titler Pro 7 Express but it seems that it only functioned in the Suite versions of Vegas Movie Studio.

NBFX have produced special versions of Titler Pro for other NLEs but have advised that those special versions cannot be replaced by the full version of Titler Pro 7 - https://newbluefx.zendesk.com/hc/en-us/articles/115000439806-Is-Titler-Pro-7-compatible-with-Corel-VideoStudio-Pinnacle-Studio-or-Cyberlink-PowerDirector- While this of course does not directly mention Vegas Movie Studio, it perhaps gives an indication that NewBlueFX's approach might be similar for Vegas Movie Studio compatibility.

Hopefully, there may be someone on the forum (if any) who has been successful in getting Titler Pro 7 to work in Vegas Movie Studio may be able to provide clarification.