So done bit of testing with Drew Technology PassThrue cable for GM cars Mongoose GM2 Pro on vectra C, Astra H, Zafira B
So results:
1. Affordable price under £500 (bought for £484 with VAT and postage)
2. Works with Tech2Win thats best thing (official subscription first time buyer 1 day 25.39 EUR than 10 EUR a day plus 3.9% handling fee) not cheapest but must have it
3. Supports all windows 32/64 bit

So warning is because it wont communicate with Low Speed Can
On Vectra C modules are IPC, BCM, DDM, PDM and some more
On Astra H modules are nearly same
So if replacing CIM you will start with CIM and will end up with CIM because all other ecus will be Mondatory ECU not present.
So dont waste your time and money its not completely compatible with vauxhall cars so Tech2 or MDI
Cable tested ready for shipping back