This is only if you already had a reserve for win 10 anyone who does not already have reserve are up the creek.
Obtaining and installing the latest Win7 Update Client(7.6.7601.23453) included in KB3161608 has no bearing on having reserved Win10.
- the pre-requisites are Win7 SP1 and the April 2015 Servicing Stack update
Windows 7 Sp1
https://support.microsoft.com/en-us/help/15090/windows-7-install-service-pack-1-sp1
April 2015 Servicing Stack Update
https://support.microsoft.com/en-us/kb/3020369
Windows 7 June rollup which contains 7.6.7601.23453
https://support.microsoft.com/en-us/kb/3161608
Optionally, if Win7 SP1 hasn't been updated through April 2016 the MSFT Convenience Rollup(April 2016, KB3125574) can be downloaded and installed after having installed the pre-requisite April 2015 Servicing Stack Update.
The Convenience Rollup is available from the Catalog or via Direct Links
Catalog - KB 3125574
http://catalog.update.microsoft.com/v7/site/Search.aspx?q=3125574
Direct Links
x64 - 64 bit
x86 - 32 bit