unable to upgrade from to 6.3

Using ver., W10, 64 bit version Attempted to upgrade from the L.O. site. I now have lost version 6.2 Continue to get the same error 1303 message. Any help will be greatly appreciated

Have a look at the General Installation Issues (Windows).

Here is what happened as best I understand it. The original upgrade attempt deleted the 6.2 shortcut and it deleted L.O. from the Apps and features and therefore the program was not visible for me to delete. Later I checked C:\Program files\L.O.\ and the folder was still there although it was empty. I deleted the empty folder, tried to upgrade again and I was successful. Went to tools-Options-L.O.-advanced added jre and I am back in business. I updated my laptop without this problem happening.