Look at the ROI of paying the fee vs not paying it.
Because you are using Simulation you are caught in a trap. Standalone simulation software like NENastran would allow you to keep the two separate.
The ROI of renewing is composed of:
1. Cost of relearning the interface/features
2. Cost of documenting bugs in new software vs a stable SP4 or greater release.
3. Benefits of any new features (typically small in terms of time spent)
4. Cost of renewing all the other software that is tied into SW
5. Cost of reworking macros and other API code.
6. Upgrading hardware to keep up with slower rebuilds new releases typically have (avg. 4% slower each new release)
7. Cost of installation of new release.
8. Cost of the renewal fee.
So let's say you are going to spend $1,000 per seat for #1 and #2, $2,000 for #5 and $14,000 for the renewal. That comes to $21,000 of cost which has to be balanced by a greater than $21,000 benefit. If your people have a burden rate of $50/hr then you need to see a time savings of 84 hours per year in increased productivity due to the upgrade just to break even.
If you are loading the last SP of the current release when you upgraded last time and in general, then there is no benefit from support or service packs.
I don't think you can get away with upgrading just one license, especially with a network license. Among other things, it is unethical and probably illegal.
I would look more at configuring the network license so you need maybe one seat of Premium and have the rest Standard and share the Premium. Get a standalone FEA and CFD package that isn't tied into the core CAD software with the $14,000. That would save you a ton on maintenance.
Just my two cents and don't forget to support eng-tips with the money you save.
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