IBM SPSS Statistics will only be supported another year (End of Service ) Here are the lifecycles for the currently supported versions: If you would like to test IBM SPSS Statistics 25.0 for a trial period, then you would need to contact IBM SPSS Sales and make arrangements to obtain the installation media and apply a short term license. IBM SPSS Statistics 25.0 thru 28.0 are the currently supported versions of the IBM SPSS Statistics On-Prem product.
The Trial software offered is always the latest release. The IBM SPSS Statistics Trial software is identical to the IBM SPSS Statistics Subscription software, albeit with a much shorter license period.