DSP builder 8.1 license problem

[Altera_Forum]

Hi everyone, 

 I'm trying to use DSP builder 8.1 but I'm having problems with the license.   I was using DSP builder 7.2 and it wokred fine, but I needed to use dsp builder 8.1 so I removed dsp builder 7.2 and installed 8.1. This is when I had the license problem. I downgraded to dsp builder 7.2 again, and the license worked fine again.:confused:    I returned to dspb uilder 8.1 and the problem arose for the second time.  :confused: :confused:    I have both quartus II 7.2 and quartus II 8.1 on my machine.  My enviorment variable points to the correct license file, I see the D4_C5 feature in quartus, yet I'm still getting this license problem. http://www.alteraforum.com/forum//images/icons/icon9.gif    Can anyone help me?     10x   Gilad

[Altera_Forum]

Are you using the same project for both versions? 

If so, try deleting the "db" folder on your project and start the compilation again  Regards Thiago

[Altera_Forum]

The problem occurs before any HDL files are generated- just when I am starting to use Signal compiler block.  

 Someone told me that there was a same problem when updating from dsp_builder 6.1 to 7.2- the license needs an update. Seems to me quite weird, to be honest...:confused:

[Altera_Forum]

What is the expiration date in your license file? 

(for the DSP Vuilder function)

[Altera_Forum]

The problem was indeed with the DSP_Builder license- it did not expire but it did not support DSP Builder 8.1.  

 10x for you help :)