Hi,
I had DBXL v2.5 successfully installed on a Windows 2008 R2 server last fall, then we/I had to change our Sharepoint 2010 server from http to https. The first change was made to move the Sharepoint site, then on to DBXL. I received an DBXL 2.6 version upgrade this week (still beginner version) and so uninstalled DBXL 2.5, then ...