Hello.
I usually update Clamwin manually. For a while, I updated it directly. After that time, there are .cld files instead of .cvd files in the "db" folder and "mirrors.dat" has added too. Now I want to update Clamwin manually again. What do I do?

Just update like you have been doing. The normal files are cld extension . I believe cvd extension indicates an incremental update.

Regards,

.cvd files are complete db files
.cld are "recreated" db files using inclemental files
mirrors.dat handles status of mirrors (blacklist etc) when e.g. updates fail from a mirror

Thanks GuitarBob and Sherpya.
Finally, I replace .cvd files instead of .cld files and Clamwin was updated successfully.