Try using a different browser and turning off ad-blockers and pop-up blockers.
Under certain circumstances, some people might experience problems downloading conversions done in Studio (previously Projects) and videos or audio dubbed using the dubbing feature. The common denominator for this seems to be the browser where most people are using a browser called Brave, which is causing issues for them. However, we've also heard certain users experience issues with other browsers. In most cases, the issue seems to be resolved when they switch or test a different browser to download the files. We also recommend turning off any ad-blocker or pop-up blocker.