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Adobe has just put out a couple of very helpful resources if you're running into any issues downloading or installing CS5 products… If you've hit a snag, these are some of the first places you might look (after confirming your system meets the minimum Creative Suite 5 requirements for Windows or Mac):
Fix download issues with the Download Manager
CS5 software packages are quite large (the full Master Collection suite is ~5 GB), so Adobe uses the Akamai Download Manager to facilitate their download. If you're having any trouble installing or running the Download Manager, see the FAQ for this topic. If nothing happens when you click the product's trial download link, or a blank window or coffee cup icon appears, or a "File not found," "server not found," "Windows cannot open this file," or "add-on disabled" message appears, then see this page to solve your problem. There's also more general download help.
[ UPDATE (5/3/2011) – If you need to, you can bypass the Akamai Download Manager and Adobe Download Assistant entirely by downloading it using the new CS5.5 Direct Download Links.]
If it's easier or if you prefer, you can order a trial DVD set for any of the CS5 suite editions: Design Premium, Web Premium, Production Premium, or Master Collection, and it will be delivered to your home or business… A DVD set can serve as your backup media if you choose to purchase at the end of 30 days, or you can have a full product box delivered to you when you purchase and simply use that serial number to convert the trial you already installed.
Fix installation issues with Creative Suite products
There are several good resources for solutions. The Adobe Support Advisor (ASA) can analyze your install logs and identify errors generated during unsuccessful Adobe Creative Suite 5, Creative Suite 4, or Creative Suite 3 product installations. The ASA provides information about documentation for these installation known issues, and it expedites the troubleshooting process by generating files that you can upload, if necessary, to an Adobe technical support agent.
If you're still stuck, there are two major Knowledgebase pages on CS5 installation: Troubleshooting installation for Adobe Creative Suite 5 products and Troubleshoot install errors using Creative Suite 5 install logs. These can also help provide answers.
Lastly, when reinstalling, the Adobe CS5 Cleaner Tool (also known as the CS5 Clean Script) helps in resolving installation problems for Creative Suite 5 software. The tool can clean up install records for any pre-release installations of CS5 products. The CS5 Cleaner Tool is designed to not interfere with existing installations of previous versions of Adobe Creative Suite products. The tool can also be used to resolve installation problems for Adobe CS3 and CS4 applications, and you can specify which at cleanup time. Run it after you've used the operating system's uninstall procedure on all desired software.
If you are still unable to successfully install your CS5 application after following the tool's instructions, Adobe Technical Support will help you install or troubleshoot an installation issue with a trial version of Adobe products. Additional phone and web support is available only for registered users of purchased software.
Note that CS5 free trial downloads are now available in 16 languages in Mac or Windows:
Czech, Danish, Dutch, English, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, and Swedish!
And if you'd like a free CS5 eBook to accompany that free trial, you can download it here (172 pages). Or browse the free online documentation and manuals for Creative Suite 5, or get trained with 17+ hours of free new CS5 online video tutorials.
Source: https://prodesigntools.com/if-any-problems-downloading-or-installing-cs5.html