Didn't sync also with the portable version,
should I try deleting blockchain_headers anyway?
where would I find it?
If the portable version didn't sync either then I doubt deleting the blockchain_headers file from the installed version would help.
Is your firewall or antivirus software stopping your wallet connecting to the internet? Most of them have a list of blocked software in their settings.
By the way your 0.00388651 BTC payment to 1KWVdojogcq6FQACNYuhpuz52U6Nds2h3i shows on blockchain.info.
https://blockchain.info/address/1KWVdojogcq6FQACNYuhpuz52U6Nds2h3i