Hello Knightdk,
There is nowhere the file 'blocks' on my desktop? continue anyway?
That is a problem, but sure, continue anyways. Did you happen to delete anything between the time when this problem happened and now?
I started the program after following instructions.
Now the program started with "synchronizing with network"
That means it has to download again the whole amount of GB's of data like the prog done it before?
B.t.w. this time I got a question when starting Bitcoin Core, It asked if I wanted to store on Desktop or custom location, Application Support.
I have chosen Application Support.
Yes, it will be downloading the blocks. And that is good keeping it Application Support.
Btw, keep your backups.