Following are the steps to apply the upgrade for SOLR
1 - Stop Solr.
2 - Rename the SOLR ibi\WebFOCUS92\Solr\solr to ibi\WebFOCUS92\Solr\solr_old.
3 - Extract the compressed file (zip or tgz) downloaded from
https://solr.apache.org/downloads.html into the folder ibi\WebFOCUS92\Solr\solr.
4 - Copy the file
ibi\WebFOCUS92\Solr\solr_old\server\solr\ibi-protected to ibi\WebFOCUS92\Solr\solr\server\solr\ibi-protected
5 - Start Solr
Note: Make sure to keep the backup of existing files, to avoid any loss.