Here is a log file to fix VM12 license problems
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\VMware, Inc.\VMware Workstation\Dormant]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\VMware, Inc.\VMware Workstation\Dormant\License.ws.12.0.e1.201505]
"StartFields"="Cpt, ProductID, LicenseVersion, LicenseType, LicenseEdition, Field2"
"Field2"="Option, Epoch"
"Cpt"="COPYRIGHT (c) VMware, Inc. 1999-2015"
"ProductID"="VMware Workstation"
"LicenseVersion"="12.0"
"LicenseType"="Site"
"LicenseEdition"="ws"
"Epoch"="2015-05-01"
"Option"="19"
"Data"="MaxVcpusPerVm=8;mdate=2015-03-21"
"DataHash"="aa495f5b-a02cc718-ba192372-3393a1ba-fdb5e6d0"
"Hash"="f32baca2-cfe0f380-659bc70c-442a9688-6df344d8"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\VMware, Inc.\VMware Workstation\Dormant\License.ws.12.0.e2.201505]
"StartFields"="Cpt, ProductID, LicenseVersion, LicenseType, LicenseEdition, Field2"
"Field2"="Option, Epoch"
"Cpt"="COPYRIGHT (c) VMware, Inc. 1999-2015"
"ProductID"="VMware Workstation"
"LicenseVersion"="12.0"
"LicenseType"="Site"
"LicenseEdition"="ws.vl"
"Epoch"="2015-05-01"
"Option"="19"
"Data"="MaxVcpusPerVm=8;mdate=2015-03-21"
"DataHash"="9c1fd1a3-49c3429c-641e9076-da73b697-d2ee0588"
"Hash"="9811fc4e-e4f95a51-1b40c17c-ad0b652e-20218f07"
For your safety, the program never starts it for the first time when I extract the registry