Thanks for the help.
It worked.

Nevertheless blockchain.info says:


in- and out

received 0.2358 BTC  
transmitted 0.2357 BTC  
fees 0.0001 BTC  
BTC transmitted, estimated 0.00769 BTC  

(translated from German to english by me)

What is this line BTC transmitted, estimated [value]?

Hi,

I updated botcoin qt Client from Version 0.8.4 (32 Bit) to Version 0.11.2 (64 Bit).
After updating all receive addresses have been removed (or aren't shown any more).

The Problem ist that I got a payment to one of this not any more shown bitcoin addresses.

Is it possible to add my old receive addresses again to the bitcoin qt Client?

In the blockchain I can find this Transaction with the transaction-ID I got from the sender. It also Shows that those bitcoins haven't been transmitted yet.

I have an backup of my wallet.dat and know the address it was sent to.

So would it help to Import my old wallet.dat or install the old Client and Import the wallet.dat then on another Client and disabling the program on my main Client while doing that?

The key pairs for this address should be written down in the wallet.dat - is that correct?