just for history:
to fix this problem I called 'sh /root/plesk-installer --select-product-id plesk --select-release-current --upgrade-installed-components' before install new components. Seems that I used outdated versions of components and this was a problem.
I also found some articles about rpmdb:
Plesk autoinstaller fails on yum operations: yum hangs or rpmdb open failed
Plesk update failed: RPMDB altered outside of yum
but they won`t help
Hi! I`m trying to install additional components through cli installer, but there is a problem with rpmdb:
sh /root/plesk-installer --select-product-id plesk --select-release-current --install-component spamassassin --install-component courier
Downloading file products.inf3: 0%
Downloading...