Over the next weeks, MetaQuotes will enforce an MT4 update to version 6.00 on its users. This version is not compatible to previous MT4 versions, so many EAs won't run anymore.

If you have Zorro's MT4 bridge already installed, the update is supposed to go smooth and the bridge will continue to run fine with the new version. But when you install the bridge on a new MT4 600+ version, the installation is now different.

For Zorro versions 1.20 and below: You need Zorro.ex4, not Zorro.mq4. Second, the MT4 shadow folders are now all different. You can download the new archive with Zorro.ex4 here:

http://server.conitec.net/down/ZorroMT4.zip

The Zorro.ex4 EA now goes into this shadow folder:

C:\Users\YourName\AppData\Roaming\MetaQuotes\Terminal\SomeStrangeCodeSequence\MQL4\Experts

And the ZorroMT4.ex4 and ZorroMT4.dll go into this shadow folder:

C:\Users\YourName\AppData\Roaming\MetaQuotes\Terminal\SomeStrangeCodeSequence\MQL4\Libraries

After that, the Zorro bridge should work with version 600+ as before.

The new Zorro 1.22 version that's available on the "Starting" section contains a new bridge for MT4 V600+, so you don't need the advices above and can directly install the bridge as desribed in the manual.