https://support.industry.siemens.com/cs ... /109773842
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important notice:
To ensure high security standards, our software is given a digital signature, among other things. This signature is checked by the operating system to detect any possible modifications made to the software from outside sources.
If you are unable to install the product or an individual HSP, this may mean that the certificate stored in the operating system must be renewed. You can find more information on this at 109747789
It is not longer possible to install S7 PDIAG V5.3 when using STEP 7 V5.6 SP2.
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https://support.industry.siemens.com/cs/de/en/view/109772208