Hi,
this will almost certainly be a problem with the custom filename templatest that you have set up - newer versions of SharpCap check these templates and can spot if they are set up in a way that could cause new captures to try to overwrite old ones. If you had previously set up the filename settings in a way that could cause that problem then the newer versions of SharpCap will force you to fix the problem before you can save the settings.
You will need to make the changes as prompted to the templates (once you fix one, you may see an error appear for a different one until they are all fixed). As an example, I took the '{Time}' component out of my template for captured video files - SharpCap spots that would lead to multiple video captures of the same target on the same date overwriting each other and makes you fix the problem.

- Screenshot 2025-01-24 140701.jpg (31.23 KiB) Viewed 538 times
Hope this helps,
Robin