Hello alainmarchand and welcome to the forum.
TR5 itself was not part of the Group Buy. The Group Buy covered the individual TR5 plug-ins. TR5 is currently on sale for 99.99 (plus VAT). Please see
https://www.ikmultimedia.com/products/tr5/?pkey=tr5And, as you were a participant you could use the coupon code (sadly, I cannot remember what it is) to get a further 50 discount, down to 49.99.
Here is some info from the GB thread on KvR:
1 Resizing (and some other features -see below) is NOT available for individual plug-ins.
2 It is available for those that choose to purchase one of the three bundle/collection packages (TR5, TR5 De Luxe, TR5 MAX, not TR5 Custom Shop) instead of building up singles.
3 If those features are important to you, that is something you'd need to weigh vs the value of what you get free with this Group Buy.
4 If you have a T-RackS 5 bundle you'll have resizing for your T-RackS plugins (not just those in the suite).
5 Of course, you could use JamPoints earned on your entry into the T-RackS Group Buy (and/or other IK purchases) toward one of the 3 bundles, being careful to select plug-ins not included in the bundle.
The T-Racks 5 Custom Shop page says (my text tinting):
What's NEW - 4 new processors available for separate purchase: Master Match, Dyna-Mu, ONE, EQual
- Resizable*, redesigned interface and plugin GUIs
- Expandable broadcast-ready metering suite*
- Floating meters option*
- Chains of up to 16 processors
- Album Assembly section with waveform editing and metadata*
- Enhanced audio engine
- Up to 192 kHz/32-bit floating point*
- 4 dithering algorithms
- Equal gain option*
- Signature presets from the industry's top engineers*
* Features available by upgrading to T-RackS 5, T-RackS 5 Deluxe or T-RackS 5 MAX.
https://www.ikmultimedia.com/products/tr5cs/