uninstall old LE manager and reinstall the certs with auto ssl
Can I do this is reverse direction ?
I have about 10 sites use SSL from old LE Manager.
Can I first update SSL for those sites from AUtoSSL generator and then remove LE Manger ??
Dude, you should remove old certificates first. Restart apache, then use the new method ("SSL Cert manager"), choose AutoSSL tab, then install the new certificate. It's super easy. If your are having problem while verifying certificate, try temperately remove .htaccess at public_html folder
A final step, restart apache.