Upgrade failed.

[clothahump]

Fatal error: Call to undefined function tp_loadtheme() in /home2/ciderpress/public_html/Sources/Load.php  on line 1165

[G6Cad]

do you have the same error in the default curve theme ?

[clothahump]

Unable to login let alone change the theme?

[IchBin]

Sounds like you need to go through the install manually if that is the case. Upload all files, edit the SMF files that TP requires, and then run the tpinstall.php file.