hi i have problems to install the custom map khoor island,
i follow the instructions, after the install i log in to the server and get everytime the message
kick reason: CRC check failed. repair needed

i repair the client more times and install the client too more times

I tried with a official custom map and there it worked where is the problem?

There is no problem... this is standard behavior. You can't join a server immediately after map installation. Read the instructions please.
Just wait until it lets you join.
It can take hours sometimes.

i waited one time over 24 hours
with the official map i made it in less than 5 hours

Oh yeah that's definitely long enough of a wait. Maybe some files got corrupted.
What you can do to repair:

• Shut down the server
• Make sure custom map terrain files are placed in /data/terrains/ folder.
• Delete the /data/terrains/cached folder
• Start server and don't touch it for some hours, see if you can join then.