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Summary
Unable to install PC host cause wizard shows "HP QC Integration" must be uninstalled
Error
Unable to install ALM PC 12.5 Host installation because the Install Wizard displays a notification saying it is required to uninstall "HP QC Integration".
Cause
On the pchost.log in the temp directory where it was failing this message appears:
MSI (c) (18!EC) [04:33:44:786]: Creating MSIHANDLE (6) of type 790531 for thread 5100
ExistingProductsCA: Product 'HP QC Integration' with upgrade code '{EB221B44-30B0-424D-88A6-E7C42DFCC72C}' found installed on local machine
MSI (c) (18!EC) [04:33:44:786]: Closing MSIHANDLE (6) of type 790531 for thread 5100
MSI (c) (18!EC) [04:33:44:788]: Creating MSIHANDLE (7) of type 790531 for thread 5100
HP Performance Center Host 12.50 cannot be installed while the following applications are installed on the machine.
Uninstall all applications before re-installing 'HP Performance Center Host 12.50'.
• HP QC Integration
MSI (c) (18!EC) [04:33:47:905]: Closing MSIHANDLE (7) of type 790531 for thread 5100
CustomAction ExistingProductsCA returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
MSI (c) (18:24) [04:33:48:098]: Closing MSIHANDLE (1) of type 790542 for thread 4780
MSI (c) (18!EC) [04:33:44:786]: Creating MSIHANDLE (6) of type 790531 for thread 5100
ExistingProductsCA: Product 'HP QC Integration' with upgrade code '{EB221B44-30B0-424D-88A6-E7C42DFCC72C}' found installed on local machine
MSI (c) (18!EC) [04:33:44:786]: Closing MSIHANDLE (6) of type 790531 for thread 5100
MSI (c) (18!EC) [04:33:44:788]: Creating MSIHANDLE (7) of type 790531 for thread 5100
HP Performance Center Host 12.50 cannot be installed while the following applications are installed on the machine.
Uninstall all applications before re-installing 'HP Performance Center Host 12.50'.
• HP QC Integration
MSI (c) (18!EC) [04:33:47:905]: Closing MSIHANDLE (7) of type 790531 for thread 5100
CustomAction ExistingProductsCA returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
MSI (c) (18:24) [04:33:48:098]: Closing MSIHANDLE (1) of type 790542 for thread 4780
Fix
Delete EB221B44-30B0-424D-88A6-E7C42DFCC72C from Registy