Parallel software not compatible on my mac version OX EL CAPITAN 10.11.4

I am using OS X 10.11.4 (15E65) and Parallels 11.1.3 without any issues

http://www.parallels.com/products/desktop/#c50587

What version of Parallels Desktop are you using? A Sparkleberry notes, Parallels 11 is compatible and the latest update to Parallels 10 is. I doubt older versions are since it is quite common for Parallels to require upgrading every other version of the Mac OS.

my parallel 11.0.0.

My OS X Capitan 10.11.4.

USB of my hard disk drive doesn't work to switch between OS X and windows.

I should find 11.1.3 of parallel desktop. Is it?

I have a MacBook Air OS X EI Captain Version 10.11.3. I would like to install the parallels SW and would like to know the system requirements. GB storage etc...

Kindly advise...

Cheers,
Dr. Shree

http://kb.parallels.com/en/123276

Parallels Desktop 11 for Mac system requirements

APPLIES TO:

• Parallels Desktop 11 for Mac
• Parallels Desktop for Mac Pro Edition
• Parallels Desktop for Mac Business Edition
• Customer Service and Licensing

To install and set up Parallels Desktop 11 for Mac, you need:

Hardware:

• A Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, Core M or Xeon processor
• 4 GB of memory (8 GB recommended)
• 850 MB of disk space on the boot volume (Macintosh HD) for Parallels Desktop installation
• Additional disk space for virtual machines (varies on operating system installed)
• Internet connection

Software:

• OS X El Capitan 10.11.1 or later
• OS X Yosemite 10.10.4 or later
• OS X Mavericks 10.9.5 or later

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Your mileage may vary. Any advice given is based on my experience. I have purchased shareware/commercial software in any advice given and have no financial interest in any products mentioned.