@Silvie Luisa Brázdilová,
The license being checkout/checkin when the simulation starts and finishes is intended. You can "reserve" the license as shown in this Knowledge Base (KB) page.
Based on your entitlement/records, you have a commercial license. For commercial license users, please register with Lumerical support. And submit a ticket through the Lumerical/Optics support portal. Thank you.
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