Backup your old wallet.dat
Delete all old Syscoin files (both the main application and data folder) except the wallet.dat
Empty your recycle bin
Download and run Syscoin 2.(x), you should now have your balance on a non-hd wallet
Go to Options/Wallet and check the "enable coin control features"
Go to send tab, click on the "inputs..." button
This will open a page with all your addresses, copy them all somewhere
Go to console help/debug window
Type "dumpprivkey XXXXXXXXXXX" without the quotes, replacing XXXXXXXXXXX your first address
Record that private key somewhere (don't loose it or let anyone see it!)
Do the same thing for each address you recorded on the "inputs..." screen
Now, backup your wallet.dat and delete everything from your %appdata%/syscoin folder, restart syscoin.exe
this will create a brand new wallet.
Go to console
Enter "importprivkey XXXXXXXXXXX", without the quotes and this time XXXXXXXXXXX means the private keys you recorded earlier
Do that for each address that you recorded, and voila your coins should be in your new wallet.