I came on the idea to store funds in the blockchain, rather than in a wallet, when I should recieve an ERC20 token in my wallet that is not supported in my wallet yet, but I understand that the recieving adress should be the same as my ethereum-adress in my present wallet.

So what about creating a new wallet for Ethereum, then use the Ethereum recieving adress from there, and then never use that wallet before I will use the funds that has been sent to me. Then right before I should catch in the funds in the wallet, I will download the newest version of the wallet which I then assume will update my old version of the wallet. Then catch in the funds in the wallet.

I am still some kind of a newbie, so do anyone see issues with that kind of procedure and storage?

Wow, do I have the right password? 

I used the console trying out different old passwords that I had that I thought could suit, and for over an hour I got the message (after entering enter):

Error: The wallet passphrase entered was incorrect. (code -14)

But then, in my last try, I got a blank space after entering enter. So I tried the same password again, and got the same blank space.

So do I have the right password?

I had some special characters  in the password, but I didnt need to put in marks in the console of that reason.

Thanks again HCP for the detailed explanation. If I do get grab of my funds, I will try to send you something.

Thanks very much for the answeres, espesially HCPs more detailed answer is just what a newbie like me need.

The first task for me now is then to try out several passwords I used back then, but I have never used a command interface before, and are afraid of doing something wrong that is closing the whole system.

So what happends if I somewhere type in a wrong character, or dont type in a correct space?

If I, for example, should try with the password 12345, is it then correct that i type in the following (and after that hit enter):
walletpassphrase 12345 1

Or is the last number (1) a command that tell me I shall hit enter?

Is it an option for me to try out my password by trying to send one satoshi to a fake / or real bitcoinadress despite that my current wallet is empty?

Thanks for the answers so far, but as a newbie i feel there is many traps I can get stuck in in this procedyre. Or isnt it? For example shouldnt I first utdate my old wallet before importing my private keys into Electrum?

Now it is late night here I live, so I have to go to bed. But i will see tomorrow  .

In the autumn of 2013 I downloaded a bitcoin wallet (Bitcoin QT v0.8.5-beta) to my laptop and buyed half a bitcoin. The wifi I then used was not fast, and I therefore gave up the downloading of the blockchain after some hours.

I opened the same wallet these days, and I see I then had downloaded about 1/15 of the blockchain (222 weeks behind). I read some place that the blockchain now is about 1 TB big, and I have only 724 GB free space on my harddisk on my laptop.

I now had the downloading of the blockchain going for about 2 hours, and it is now standing at 224 weeks behind, and there is now a message in my wallet that says: URGENT: Alert key compromised, upgrade required

So I now need advice for how I can recieve my bitcoins in the simplest possible way for a newbie like me  and hopefully not loose my bitcoins  .

My provisional plan for doing this is to first make a backup of my Bitcoin QT wallet on a pendrive. Then update the Bitcoin QT wallet to the latest Bitcoin Core wallet, and then download the Electrum wallet and sweep over the private keys from the Core wallet to the Electrum wallet. Where is the weakest point of this plan? And is there a better way to do it?

Can I assume the old fee from the sender now is way too low? Is it then possible that the sender can repeat the sending with higher fee (because I assume this is the easiest way out)?

My  Bitcoin QT wallet is encrypted, but I am not shure I have the right pasword, and I do not find a place in my wallet to test it out. Do I need my password in this plan?

In the autumn of 2013 I downloaded a bitcoin wallet (Bitcoin QT v0.8.5-beta) to my laptop and buyed a half bitcoin. The wifi I then used was not fast, and I then gave up after some hours of downloading.

I opened the same wallet now, and I see I had downloaded about 1/15 of the blockchain (222 weeks behind). I read some place that the blockchain now is about 1 TB big, and I have only 724 GB free space on my harddisk on my laptop.

Today I had the downloading going for about 2 hours, but it is standing still at 222 weeks behind, and there is a message in my wallet that says: URGENT: Alert key compromised, upgrade required

So I now need advice for how I can fix this in the simplest possible way for a newbie like me  and hopefully not loose my money  .

I did not find a update link in my wallet, so have I then to go to the site of Bitcoin Core (formerly Bitcoin-Qt) and download their new wallet?, or are another wallet more suitable for me in this situation?

And what to do with the space-limit on my harddrive? I am willing to buy a big external harddrive, or should  I buy a new and bigger computer?

Have I now lost the possibility to get my Bitcoin Cash, that was splitted from Bitcoin, because I did not catch in my Bitcoin before the splitting ?