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Can't install Code Generation Tools Updates through Help->InstallSoftware

HI,

I've just Intstalled CCS Studio 12 on my windows10x64 laptop.

For certain use case I need to install ARM Compiler Tools 5.1.6.

But when I try to Install them by opening Help->Install Software and start a fetching, 

the follow error occurred and nothing installable comes on. 

the error detail is:

Unable to read repository at software-dl.ti.com/.../content.xml.
Unable to read repository at software-dl.ti.com/.../content.xml.
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

If I open the url in a browser, the site say that this site is undergoing a system maintenance.

But there is no any info about when will the maintenace over and since this notifacation has last 3 days I doubt that if the maintenance would over.

I couldn't start my work without the compiler tool.

Where and how can I get It?