The SolidWorks 2019 products were provided by Technion and it's about to expire on 31-July-2021. If you prefer keeping everything with 2019 version, you can just renew the license without having to uninstall it then reinstall 2021 packages. Please follow below steps to complete the process:
  

1. Double-click to open Solidworks 2019 and navigate to the top-right corner, click Question Mark then select Deactivate Licenses…

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Ctrl+F2

 

2. Select Automatically over the internet (recommended) then click Next:

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@SOLIDWORKSProductActivation
Activate/Deactivate丫OurSOLIDWORKSProduct
Youshouldonlydeactivateyourlicenseifyouwishtoupgradeyourcomputerhardwareormove
yoursoftwaretoanothercomputer.
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C)Manuallyviae-mail
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pleasereviewourPrivacyPolicy.
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Cancel
Help

 

3. In a few seconds you will see that Deactivation succeeded:

Machine generated alternative text:
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5SOLIDWORKS
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Result
Deactivationsucceeded.
Currentlyactivatedproducts.
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ActlvaüonExpres
Cancel
Refresh
Help

 

4. Open your Windows 10 Settings then click Apps & features, click Modify:

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Settings
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16/07/2021
16℃KB
21/05/2021
19/07/2021
1
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16.0KB
29/06/2021
4&4MB
30/04/2021
116MB
02/07/2021
28/06/2021
16.0KB
26/05/2021

 

 

5. Click OK to continue the installation:

Machine generated alternative text:
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6. Select Modify the individual installation (on this computer).

Machine generated alternative text:
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SOLIDWORKS
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7. Enter new Serial Number which is used for SolidWorks 2021 SP3 activation:
 9020004875643646HVNB8379
 
Click Next:

Machine generated alternative text:
.SOLIDWORKS2019SP2.OInstallationManager
SOLIDWORKS
2019
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SerialNumber
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ProductSelection
Summary
Download
Install
Finish
Cancel
0
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FlowSimulatlon,Motion,Plastics,Simulation
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CAM
TechnicalCommunicaton
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Composer,ComposerPlayerPro,Inspect0‰MBD
ElectricalDesign
ElectncalSchematic,PCB
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Login
Next

 

8. Click Next:

Machine generated alternative text:
.SOLIDWORKS2019SP2.0InstallationManager
SOLIDWORKS
2019
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SOLIDWORKSPremium
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SOLIDWORKS
(192KB)
SOLIDWORKSLanguages
wings
OLIDWORKSExplorer(383MB)
OLIDWORKSFlowSimulation(930MB)
pV360NetworkClient(294MB)
OLIDWORKSSimulationWorkerAgent(17MB)
OLIDWORKSPlastics(1.1GB)
OLIDWORKSElectrical(1.1GB)
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Estimatedadditionalspacerequired:篁0MB
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Next

 

9. Click Modify Now:

Machine generated alternative text:
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ModifyNow

 

10. Wait a short while until the selected products are installed:

Machine generated alternative text:
.SOLIDWORKS2019SP2.0InstallationManager
SOLIDWORKS
2019
Welcome
Seria丨Number
SystemCheck
ProductSelection
SummaIY
Down《oad
InstaIl
Finish
Cancel
SOLIDWORKSPremiumwillhelpyou:
0
Worksmarterandfaster
ImprovethequalityOfyourdesigns
Simplifyyourentiredesignprocess
Accesstips,tricks,advice,andguidancefromtheentireS0LID℃RKScommunity
InstallingSelectedProducts
ConfiguringToolbox
19%complete

 

11. Reactivation Succeeded, the new expiration data is 7-31-2023

Machine generated alternative text:
@SOLIDWORKSProductActivation
Result
Activation/ReactivationSucceeded.
71一202彐
71一202彐
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About.„
Currentlyactivatedproducts.
Product
SOLIDWORKSComposerProfessional
SOLIDWORKSElectricalProfessional
SOLIDWORKSFlowSimulation
ElectronicsModuleforSOLIDWORKSFlowSim.„
HVACModuleforSOLIDWORKSFlowSimulation
SOLIDWORKSMBDStandard
SOLIDWORKSPlasticsPremium
JointheSOLIDWORKSCommunity
Findanswers.Stayconnected
<Back
Finish
ActlvaüonExpres
Cancel
Refresh
Help

 

12. Should you have any queries or questions, please contact IT Support at https://helpdesk.gtiit.edu.cn.