Hi, I tried to use the trial version of SPSS with my account but the software says: 
"Sorry, you have already used an IBM SPSS Statistics Subscription trial on this machine. To use IBM SPSS Statistics Subscription, you will have to purchase a copy. Please visit the IBM Marketplace to review purchasing options". 
I haven't used the trial version before. I am sure that no one has used it either. I tried it on many machines on which I am sure that no one used it, with the same result. I know that you generate a unique GUID for every machine so that you can recognize it in your database. The before last machine I used unsuccessfully has the following parameters:
Model: Lenovo ThinkCentre M710s
S/N: S4EC6879
Hard Disk:
Model:  WDC WD5000LPLX-08ZNTT0
Serial Number: WD-WXN1AA710VCT

Could you tell me the information you have for this specific computer, and the others I tried, if you have information about them?

Hi @Alexander Geshakov

Rather than tethering to a specific machine, the IBM SPSS Statistics Trial is tethered to your IBMid.  If the Trial period has elapsed since you first registered for it, then the Trial period is over.  The trial period starts ticking down from the moment you register for it.

Once the trial period has elapsed your IBMid is put into a "Suspended" state for the next 365 days.  After this period, you can re-register for the Trial using that IBMid.

Alternatively, you could purchase IBM SPSS Statistics Subscription, and your IBMid would then become associated with that purchase.

Thank you for your response. But I have registered on 20.10.2023 and on that date I received the following e-mail:
Hi Alexander,
Thank you for signing up for a subscription to:
- IBM SPSS Statistics Subscription Trial
Below are your subscription details.
IBM SPSS Statistics Subscription Trial
ASR Expiration Date    
November 19, 2023    

Duration    
30 days    

Start date    
October 20, 2023    

End date    
November 19, 2023    

Customer Account    
NSI    

So, that means my trial will expire on November 19, 2023 which Is far from now. 

Also the error message begins with the sentence "Sorry, you have already used an IBM SPSS Statistics Subscription trial on this machine" which, I think, refers to the specific machine I use, and this is why I mentioned more details about it. I interpret the message as stating that the problem is with the machine (which had never been used with any SPSS software). If you can give me more information about this case, it would very helpful, because I would like to understand what happens.