my catalog is from PSE10 and i need to recover it into PSE2019
Do you mean you have a PSE 10 Backup and need to restore it in PSE 2019. If so, simply go through the Restore process in PSE 2019. If you are not recovering from a backup, then convert the catalog in PSE 2019.
apparently i need to convert it in PSE2015
You may have been looking at an old article. I have just converted an old empty Elements 10 catalog into Elements 2019 without any problem. I have just started converting a catalog with media in it, but it will take a while for the conversion to complete. I will let you know if that runs into problems.
For more information about converting older catalogs, see this article.