Can I add my old Bitcoin-qt wallet address to Bitcoin Core?

[DavidO88888]

Hello Bitcoin Community Forum:

I used to pool mine Bitcoin several years ago and I used Bitcoin-qt as my wallet.  A couple of years ago in 2017, I had transferred my coins from my Bitcoin-qt wallet to a crypto exchange vault.

Going back and logging into my old Pool account, I see I still have some crypto in my pool account that I can lower my threshold to send to my old wallet address.  I could have changed my wallet address to send it to my crypto exchange vault but back when I setup my Pool account I chose to lock my wallet address so it could not be changed without my permission, now I can't change that old address without my Wallet Signature that is generated in Bitcoin-qt, and I don't have my old Bitcoin-qt software installed anymore and my old wallet backup file was deleted.  Is there any way to restore my old wallet address by manually adding it to Bitcoin Core? If not, then I guess my Bitcoin Pool account is useless now. 

Thanks for your help and suggestions.
 
Kind regards,
DavidO88888

[Rath_]

[..] I don't have my old Bitcoin-qt software installed anymore and my old wallet backup file was deleted.  Is there any way to restore my old wallet address by manually adding it to Bitcoin Core? If not, then I guess my Bitcoin Pool account is useless now.  

Since you don't have any backup or access to your previous setup, it's not possible to recover your wallet. Try contacting the support of the mining pool.

[NeuroticFish]

Is there any way to restore my old wallet address by manually adding it to Bitcoin Core?

If you don't have the private key for that address, there's nothing meaningful you can do.
Your only chance is if the pool owner is (extremely) nice and accepts to do the change for you without asking the signed message from the old wallet.

[HCP]

...Is there any way to restore my old wallet address by manually adding it to Bitcoin Core? If not, then I guess my Bitcoin Pool account is useless now. 

Unfortunately, while that will add the address into your new Bitcoin Core wallet... and you'd be able to see the coins sent to that address, and any transactions for that address... you still won't have the private key for it... so you wouldn't be able to spend those coins.

...my old wallet backup file was deleted.

Without this, you are basically SOL