[HELP] Upgrade to latest version, license error

[pipsta]

Help me please

I just tried to upgrade to the latest cPanel via WHM, and all that happens is i get a blank screen, now when i try to access cPanel/WHM I get the following message

Unknown License File Version (12)

I cant do anything, and i cant afford a re-install because all my sites are on there, it also will not let me terminate accounts, upgrade/downgrade or create accounts, this was happening before i tried an upgrade, that was the reason i done it, because i thought maybe it was a bug in that version

Any help appreciated please, i am using a 15 day test license

Dual P3 1.4GHZ
18 GB SCSI Hard Drive
2 GB Ram
100mbps Connection

Thanks

[pipsta]

It is ok now it seems to have continued with the update by itself, it seems to be working now