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Hi, Thank you for your quick reply, actually crc error stopped with version 7.55, every file is ok now smile I tried on 7.54 and got the problem, så v7.55 fixed the issue

Okay. There have actually been no changes to DCC Send/Get in recent versions, so the cause is very likely something else, eg. anti-virus software.

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The only issue I still have is the speed with Mirc

mIRC is a single-threaded application and intentionally limits transfer speed to ensure that the GUI is responsive. If you are already using the maximum packet size, there is nothing else you can do to increase transfer speed.