So finally found it.........the solution is here...............
why this problem occurs, is because all the sounds in the sound library manager have a related file in the receipts folder (Mackintosh HD/System/Library/Receipts) and this little files makes the particular sounds visible for the sound library manager............which means even though you have all the sounds downloaded and if you have deleted that particular related file in receipts folder then your sound library will not recognise that particular sound..............but you can still use all the sounds...........but the "status" will be blank.............
So to get your sound library recognise all the sounds you need to somehow copy these receipt files to receipt folder...........
and there is no strict rule that you should not copy that files from someone else's Mac..........if you know someone who have downloaded all the sounds you can surely copy from them (the receipts folder also will be having some other files related to MacOS or some other applications but you need to copy only the ones related to logic)
and paste it to your receipts folder..............
My Receipts Folder (Last Updated on 14 November 2018)=http://www.filedropper.com/lpxsoundlibraryreceipts
One more thing is that by default you cannot copy any files to receipts folder because its a system folder which will be protected by "system integrity protection".............so to disable that follow the steps below..........
- Click the menu.
- Select Restart...
- Hold down Command-R to boot into the Recovery System.
- Click the Utilities menu and select Terminal.
- Type "csrutil disable" and press return.
- Close the Terminal app.
- Click the menu and select Restart....
Now after disabling it just paste the files into your receipts folder and don't try to mess with any other folders because it may crash your Mac...........
After pasting the files now enable the "system integrity protection".............to enable that follow the steps below..........(its always better to enable it to be on safer side).........
- Click on the (Apple Logo) at the far left of your Mac's Menubar.
- Click on Restart.
- Hold down CMD + R during reboot to enter Recovery Mode.
- Click on the Utilities Menu.
- Launch Terminal.
- Type in "csrutil enable".
- Restart your Mac again.
Now after doing all these just quit all applications and open logic and it should work...........
I personally thank JotaGi and Gunbee for helping me through this.........