Skype for Business is part of the Office 365 suite of products.
You get the Skype for Business download from the Office 365 portal, and then install it on your computer. These steps usually take 10-15 minutes to do.
These instructions explain how to get to the Skype for Business download, and install it.
Tip: If you don't see the Skype for Business download in your portal, make sure the Office 365 for business plan you purchased includes it. Also, ask the person in your business who purchased it whether they assigned a license to you.
Sign in to Office 365 at https://portal.office.com/.
At the top of your Office 365 page, choose > Office 365.
Choose Software.
Depending on your Office 365 plan:
If you see the following page, choose Skype for Business, choose your language, the edition that matches your other Office applications (32 bit or 64 bit - if you don't know, choose the default) and choose Install. Then go to step 5.
If Skype for Business is bundled with other Office 365 applications, you'll see the following page. Choose Install to install the Office 365 suite of applications, including Skype for Business. When you're done, go to Sign in for the first time at the end of these steps.
At the bottom of your screen, choose Save as to download the setupskypeforbusinessentryretail.exe file to your computer.
Important: Note where you saved the setupskypeforbusinessentryretail.exe file on your computer. If Skype for Business stops during setup, this is where you go to re-run it.
After the setupskypeforbusinessentryretail.exe file has downloaded, choose Run.
The Office installer starts, and displays a message that it's installing Office. However, it's only installing Skype for Business. It is not installing all of Office.
When the Office installer is finished, it displays a message that Office was installed on your computer. However, only Skype for Business was installed. Choose Close.
Launch Skype for Business. At the First things first box, if you accept the licensing agreement, choose Accept.
Congratulations! You're done installing Skype for Business. Now you're ready to sign in to Skype for Business for the first time.